c program to print pascal triangle:

‪#‎include‬ <stdio.h>

long factorial(int);

int main()
{
int i, n, c;

printf("Enter the number of rows you wish to see in pascal triangle\n");
scanf("%d",&n);

for (i = 0; i < n; i++)
{
for (c = 0; c <= (n - i - 2); c++)
printf(" ");

for (c = 0 ; c <= i; c++)
printf("%ld ",factorial(i)/(factorial(c)*factorial(i-c)));

printf("\n");
}

return 0;
}

long factorial(int n)
{
int c;
long result = 1;

for (c = 1; c <= n; c++)
result = result*c;

return result;
}

C Program example of Nested Structure

‪#‎include‬ <stdio.h>

struct Employee
{
char ename[20];
int ssn;
float salary;
struct date
{
int date;
int month;
int year;
}doj;
}emp = {"Pritesh",1000,1000.50,{22,6,1990}};

int main(int argc, char *argv[])
{
printf("\nEmployee Name : %s",emp.ename);
printf("\nEmployee SSN : %d",emp.ssn);
printf("\nEmployee Salary : %f",emp.salary);
printf("\nEmployee DOJ : %d/%d/%d", \
emp.doj.date,emp.doj.month,emp.doj.year);

return 0;
}

C program to reverse a string using recursion

‪#‎include‬ <stdio.h>
#include <string.h>

void reverse(char*, int, int);

int main()
{
char a[100];

gets(a);

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

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

return 0;
}

void reverse(char *x, int begin, int end)
{
char c;

if (begin >= end)
return;

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

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

C program to reverse a string using pointers

‪#‎include‬<stdio.h>

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);

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;
}

HCF program with multiple numbers in c

#include<stdio.h>
int main(){
int x,y=-1;
printf("Insert numbers. To exit insert zero: ");

while(1){
scanf("%d",&x);
if(x<1)
break;
else if(y==-1)
y=x;
else if (x<y)
y=gcd(x,y);
else
y=gcd(y,x);
}

printf("GCD is %d",y);

return 0;
}

int gcd(int x,int y){
int i;
for(i=x;i>=1;i--){
if(x%i==0&&y%i==0){
break;
}
}
return i;
}

HCF (Highest common factor) program with two numbers in c

#include<stdio.h>
int main(){
int n1,n2;
printf("\nEnter two numbers:");
scanf("%d %d",&n1,&n2);
while(n1!=n2){
if(n1>=n2-1)
n1=n1-n2;
else
n2=n2-n1;
}
printf("\nGCD=%d",n1);
return 0;
}

Find g.c.d of two number using c program:

‪#‎include‬<stdio.h>

int main(){

int x,y,m,i;

printf("Insert any two number: ");

scanf("%d%d",&x,&y);
if(x>y)
m=y;
else
m=x;

for(i=m;i>=1;i--){
if(x%i==0&&y%i==0){
printf("\nHCF of two number is : %d",i) ;
break;
}
}
return 0;
}