C Progms List

7/28/2019 C Progms List

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1. Write a C program to check whether number is even or odd.

Ans:

#include

main()

{

intnum;

printf("Enter a number to be checked for even/odd: ");

scanf("%d",&num);

if(num%2==0)

{

printf("The entered number is EVEN.\n");

}

else

{

printf("The entered number is ODD.\n");

}

}

2. Write a C program to illustrate the use of STATIC keyword and the scope of variables.

Ans: #include

void func()

{

static int x = 0;

// x is initialized only once across three calls of func()

printf("%d\n", x); // outputs the value of x

x = x + 1;

}

int main(int argc, char * const argv[]) {func(); // prints 0

func(); // prints 1

func(); // prints 2

return 0;

}

3. Write a C program to check whether the given no is prime number or not?

Ans:

#include

void main()

{int n,pflag=0;

printf("enter the number \n");

scanf("%d",&n);

if(2


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{

if(n%5)

{

if(n%7) //if u need to know below 100 prime numbers.

{

pflag = 1;

}

}

}

}

}

if(pflag)

printf("%d is prime number \n",n);

else

printf("%d is not a prime number \n",n);

}

//============================================================================

#include#include

void main(){int n,i=2;

clrscr();printf("Enter a number \n");scanf("%d",&n);

while(i here the we get the remainder when n is divided by each i, at any time the remainder

is 0, the program will terminate and show a message " not prime". otherwise it will execute till i reaches to

n/2. and terminate the program and shows a message "prime".

//===============================================================

4. Write a C program to print all the prime numbers for 1 to 100.?

Ans:

#include

void main()

{

int a[100],i,j=2;


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for(i=0;i


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reverse = reverse + n%10;n = n/10;

}

printf("Reverse of entered number is = %d\n", reverse);

return 0;}

7. Write a C program to print the result of student by setting the grade (take the average sixsubjects and get the percentage print the grade) ?

8. Prepare a Current bill by verifying the following hints.From 1 to 100 units the unit charges 1 rupeeFrom 101 to 200 units the unit charges 2 rupeesFrom 201 to 350 unit charges 3.50 rupees.

If u enters the units output should display the amount.

9. Write a C program if u lower case letter output should be upper case letter ?

Ans: - 0x20 for every lower case or add 0x20 for every uppercase to get lower case.

10.Write a C program to print the Pascal triangle.Ans: A Pascal's triangle is a geometric arrangement of the binomial coefficients in a triangle.

1. The rows of Pascal's triangle are conventionally enumerated starting with row 0 which is

having only the number 1.

2. For other rows, add the number directly above and to the left with the number

directly above and to the right to find the new value .

3. If either the number to the right or left is not present, substitute a zero in its place. For

example, the first number in the first row is 0 + 1 = 1, whereas the numbers 1 and 2 in the

second row are added to produce the number 3 in the third row. In this way, the rows of

the triangle go on infinitely. Here we prompt the user to enter the number of rows to

display therefore only five rows will get displayed in the Pascal's triangle.

Sample output:

Enter the no. of lines: 8

1

1 1

1 2 1

1 3 3 1

1 4 6 4 1

1 5 10 10 5 1

1 6 15 20 15 6 1

1 7 21 35 35 21 7 1

#include

long fact(int);

int main(){


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int line,i,j;

printf("Enter the no. of lines: ");

scanf("%d",&line);

for(i=0;i


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}

12.Write a C program to print the tables 0 to 10.?

Ans: int i = 1;

int j = 1;

int result = 0

for (i = 1; i


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#include

void main()

{

int day1,mon1,year1,day2,mon2,year2;

int ref,dd1,dd2,i;

clrscr();

printf("Enter first day, month, year");

scanf("%d%d%d",&day1,&mon1,&year1);

scanf("%d%d%d",&day2,&mon2,&year2);

ref = year1;

if(year2


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return(y);

}

16.Write a C program to find the factorial of the given number?Ans:

#include

int main(){

int i=1,f=1,num;

printf("Enter a number: ");

scanf("%d",&num);

while(i


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getch();

}

19. Write a C program to sort out in the descending order from the array of given numbers.

Ans:

#include

voidmain ()

{inti,j,a,n,number[30];

printf("Enter the value of N\n");scanf("%d", &n);

printf("Enter the numbers \n");for(i=0; i


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if( strcmp(a,b) == 0 )printf("Entered strings are equal.\n");

elseprintf("Entered strings are not equal.\n");

return 0;}

C program to compare two strings without using strcmpHere we create our own function to compare strings.

int compare(char a[], char b[]){

int c = 0;

while( a[c] == b[c] ){

if( a[c] == '\0' || b[c] == '\0' )break;

c++;}if( a[c] == '\0' && b[c] == '\0' )

return 0;else

return -1;}

C program to compare two strings using pointersIn this method we will make our own function to perform string comparison, we will use character

pointers in our function to manipulate string.

#include

int compare_string(char*, char*);

main(){

char first[100], second[100], result;

printf("Enter first string\n");gets(first);

printf("Enter second string\n");gets(second);

result = compare_string(first, second);

if ( result == 0 )printf("Both strings are same.\n");

elseprintf("Entered strings are not equal.\n");


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return 0;

}

int compare_string(char *first, char *second){while(*first==*second){

if ( *first == '\0' || *second == '\0' )break;

first++;second++;

}if( *first == '\0' && *second == '\0' )

return 0;else

return -1;}

21.Write a C program to find the string length ?

Ans: #include

#include

int string_length(char s[]);

main()

{

char s[50];

int l;

printf("Enter the string\n");

scanf("%s\n",s);

l=strlen(s);

printf("Length of string = %d\n",l);

}

int string_length(char s[])

{

int i;

i=0;

while(s[i] != '\0')

++i;

return i;

}

22.By using STRCAT, STRCOMP and STRCPY. Give some example C programs related to it. ?

23.Write a C program to arrange the characters of a string in alphabetical order?

Ans:

#include

#include

#include

int main (void)


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{

char string[128], temp;

int n, i, j;

printf("\nEnter string: ");

gets(string);

n = strlen(string);

for (i=0; i


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char rev[50];

char *sptr = str;

char *rptr = rev;

int i=-1;

printf("Enter any string : ");

scanf("%s",str);

while(*sptr){

sptr++;

i++;

}

while(i>=0){

sptr--;

*rptr = *sptr;

rptr++;--i;

}

*rptr='\0';

printf("Reverse of string is : %s",rev);

return 0;

}

25.Write a C program to reverse the words of the string ?

Ans:

#include

int string_length(char*);void reverse(char*);

main(){

char string[100];

printf("Enter a string\n");gets(string);

reverse(string);

printf("Reverse of entered string is \"%s\".\n", string);


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return 0;

}

void reverse(char *string){

int length, c;char *begin, *end, temp;

length = string_length(string);

begin = string;end = string;

for ( c = 0 ; c < ( length - 1 ) ; c++ )end++;

for ( c = 0 ; c < length/2 ; c++ ){

temp = *end;

*end = *begin;*begin = temp;

begin++;end--;

}}

int string_length(char *pointer){

int c = 0;

while( *(pointer+c) != '\0' )c++;

return c;}

C program to reverse a string using recursion#include#include

void reverse(char*,int,int);

main(){

char a[100];

gets(a);

reverse(a, 0, strlen(a)-1);

printf("%s\n",a);


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return 0;

}

void reverse(char *x, int beg, int end){

char a, b, c;

if ( beg >= end )return;

c = *(x+beg);*(x+beg) = *(x+end);*(x+end) = c;

reverse(x, ++beg, --end);}

========2=====with out string==================

/*c program for reverse all words in string*/#include

#include

#include

int main()

{

char str[100];

int i,temp;

printf("Enter any string : ");

gets(str);

for(i=0; str[i]!=NULL; i++){

if(str[i+1]==' ' || str[i+1]==NULL)

{

for(temp=i; temp>=0 && str[temp]!=' '; temp--)

printf("%c", str[temp]);

}

printf(" ");

}

getch();

return 0;}

26.Write a C program to give the occurrence of a character in a string ?

Ans: In C

const char* str; // the string we want to search


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const char c; // the character we want to search for

int num = 0; // the number of times c is in str

// loop vars

int i;

const int end = strlen(str);

for(i = 0; i < end; ++i) {

if( str[i] == c ) {

++num;

}

}

27.Write a C program to addition of matrix ?

Ans:#include

int main(){

int a[3][3],b[3][3],c[3][3],i,j;

printf("Enter the First matrix->");

for(i=0;i


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printf("\n");

for(j=0;j


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getmatrix(x);

getmatrix(y);

addition(x,y,z);

printf("\n - : Matrix 1: - \n");

display(x);

printf("\n - : Matrix 2: - \n");

display(y);

printf("\n - : Matrix Addition (Result): - \n");

display(z);

}

void getmatrix(int t[][3]){

int i,j;

for(i=0;i


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display(z);

}

void multiplication(int p[][3],int q[3][3],int r[3][3])

{

int i,j,k;

for(i=0;i


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int i,j;

printf("\n\n");

for(i=0;i


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{

m=0;

n=0;

for(i=0;i


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for(j=i+1;j


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printf("Transpose of the Matrix :\n\n");

for(i=0;i


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9. Write a c program to print the string from given character.

12. String concatenation in c without using strcat

Arithmetic operation with pointer in c programming

Rule 1:Addition arithmetic with pointersAddress + Number= Address

Address - Number= Address

Address++ = Address

Address-- = Address

++Address = Address

--Address = Address

If we will add or subtract a number from an address result

will also be an address.New address will be:

(1)What will be output of following c program?

#include

intmain(){

int*ptr=(int*)1000;ptr=ptr+1;

printf(" %u",ptr);

return 0;

}

Output: 1002
http://cquestionbank.blogspot.com/2010/06/write-c-program-to-print-string-from.htmlhttp://cquestionbank.blogspot.com/2010/06/write-c-program-to-print-string-from.htmlhttp://cquestionbank.blogspot.com/2011/09/string-concatenation-in-c-without-using.htmlhttp://cquestionbank.blogspot.com/2011/09/string-concatenation-in-c-without-using.htmlhttp://cquestionbank.blogspot.com/2011/09/string-concatenation-in-c-without-using.htmlhttp://cquestionbank.blogspot.com/2010/06/write-c-program-to-print-string-from.html


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#include

intmain(){

double*p=(double*)1000;

p=p+3;

printf(" %u",p);

return 0;

}

Output: 1024


#include

intmain(){

floatarray[5]={1.1f,2.2f,3.3f};

float(*ptr)[5];

ptr=&array;

printf("%u",ptr);

ptr=ptr+1;

printf(" %u",ptr);

return 0;

}

Output: 1000 1020


#include

typedefstructabc{

intfar*a;

doubleb;

unsignedcharc;

}ABC;

intmain(){ABC*ptr=(ABC*)1000;

ptr=ptr+2;

printf(" %u",ptr);

return 0;

}


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Output: 1026


#include

typedefunionabc{

charnear*a;

longdoubled;

unsignedinti;

}ABC;

intmain(){

ABC*ptr=(ABC*)1000;

ptr=ptr-4;

printf(" %u",ptr);

return 0;

}

Output: 960


#include

float* display(int,int);

intmax=5;

intmain(){

float*(*ptr)(int,int);

ptr=display;

(*ptr)(2,2);

printf("%u",ptr);

ptr=ptr+1;

printf(" %u",ptr);

return 0;

}

float* display(intx,inty){

floatf;

f=x+y+max;

return&f;

}


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Output: Compiler error

Rule 2: Difference arithmetic with pointers

Address - Address=Number

If you will subtract two pointers result will be a number

but number will not simple mathematical subtraction of two

addresses but it follow following rule:

If two pointers are of same type then:

Consider following example:

#include

intmain(){

int*p=(int*)1000;

int*temp;

temp=p;

p=p+2;

printf("%u %u\n",temp,p);

printf("difference= %d",p-temp);

return 0;

}

Output: 1000 1004 Difference= 2

Explanation:

Here two pointer p and temp are of same type and both are

pointing tointdata type varaible.p-temp = (1004-1000)/sizeof(int) =4/2 =2


#include

intmain(){

float*p=(float*)1000;


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float*q=(float*)2000;

printf("Difference= %d",q-p);

return 0;

}

Output:Difference= 250

Explanation:

q-p=(2000-100)/sizeof(float) =1000/4 =250


#include

structabc{

signedcharc;

shortinti;

longdoublel;

};

intmain(){

structabc *p,*q;

p=(structabc *)1000;

q=(structabc *)2000;


return 0;

}

Output: Difference= 76

Explanation: q-p=(2000-1000)/sizeof(structabc)=

1000/(1+2+10)=1000/13 =76

//===================================================


#include

typedefunionxxx{

charfar * c;

constvolatilei;

longintl;

}XXX;

intmain(){

XXX *p,*q;


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p=(XXX *)1000;

q=(XXX *)2000;


return 0;

}

Output: Difference= 250

Explanation:

q-p=(2000-1000)/max(4,2,4) =1000/4 =250


#include

intmain(){

constvolatilearray[4]={0};

constvolatile(*p)[4]=&array;

constvolatile(*q)[4]=&array;

p++;

q++;

printf("%u %u\n",p,q);


return 0;

}

Output:1000 1016 (assume)Difference= 2

Explanation:

q-p=(1016-1000)/sizeof(constvolatile) = 16/ (2*4) =2

Rule 3:Illegal arithmetic with pointers

Address + Address=Illegal

Address * Address=Illegal

Address / Address=IllegalAddress % Address=Illegal

What will be output of following c program?

#include

intmain(){

inti=5;


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int*p=&i;

int*q=(int*)2;

printf("%d",p+q);

return 0;

}

Output:Compiler error

//========================================================

Rule 4:We can use relation operator and condition operator

between two pointers.

a. If two pointers are near pointer it will compare only

its offset address.


#include

intmain(){

intnear*p=(intnear*)0x0A0005555;

intnear*q=(intnear*)0x0A2115555;

if(p==q)

printf("Equql");

else

printf("Not equal");

return 0;}

Output:Equal

//=========================================================

b. If two pointers are far pointer it will compare both

offset and segment address.

What will be output of following c program?#include

intmain(){

intfar*p=(intfar*)0x0A0005555;

intfar*q=(intfar*)0x0A2115555;

if(p==q)

printf("Equql");


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else


return 0;

}

Output:Not equal

//=========================================================

c. If two pointers are huge pointer it will first normalize

into the 20 bit actual physical address and compare to its

physical address.


#include

intmain(){

inthuge*p=(inthuge*)0x0A0005555;

inthuge*q=(inthuge*)0x0A2113445;

if(p==q)

printf("Equql");

else


return 0;

}

Output:Equal

Rule 5:Bit wise arithmetic with pointers

We can perform bit wise operation between two pointers like

Address & Address=Illegal

Address | Address=Illegal

Address ^ Address=Illegal

~Address=Illegal


#include

intmain()

{

inti=5,j=10;

int*p=&i;


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int*q=&j;

printf("%d",p|q);

return 0;

}

Output:Compiler error

//========================================================

Rule 6:We can find size of a pointer usingsizeofoperator.


#include

intmain(){

intnear*far*huge* p;

printf("%d",sizeof(p));

printf(" %d",sizeof(*p));

printf(" %d",sizeof(**p));

return 0;

}

Output:4 4 2

//=====================================================================

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