C Program which tell input number is prime or not:
#include<stdio.h>
main()
{
int x,c;
printf("Enter a number: ");
scanf("%d",&x);
for (c = 2 ; c <= x - 1 ; c++ )
{
if ( x%c == 0 )
{
printf("%d is not prime.\n", x);
break;
}
}
if ( c == x )
printf("%d is prime.\n", x);
}
Also by Making Function of it:
#include<stdio.h>
void prime(int);
main()
{
int x;
printf("Enter a number: ");
scanf("%d",&x);
prime(x);
}
void prime(int x)
{
int c;
for (c = 2 ; c <= x - 1 ; c++ )
{
if ( x%c == 0 )
{
printf("%d is not prime.\n", x);
break;
}
}
if ( c == x )
printf("%d is prime.\n", x);
}
C Program which input a integer and print that numbers of prime numbers:
#include<stdio.h>
main()
{
int n, i = 3, count, c;
printf("Enter the number you want the prime number: ");
scanf("%d",&n);
if ( n >= 1 )
{
printf("First %d prime numbers are :\n",n);
printf("2\n");
}
for ( count = 2 ; count <= n ; )
{
for ( c = 2 ; c <= i - 1 ; c++ )
{
if ( i%c == 0 )
break;
}
if ( c == i )
{
printf("%d\n",i);
count++;
}
i++;
}
}
C Program which prints the Prime number according to given range:
#include<stdio.h>
main()
{
int x,c;
int m,n;
printf("Enter the First number: ");
scanf("%d",&m);
printf("Enter the Last number: ");
scanf("%d",&n);
printf("\nAll Prime numbers between these range are: \n");
for(x=m; x<=n; x++)
{
for (c = 2 ; c <= x - 1 ; c++ )
{
if ( x%c == 0 )
break;
}
if ( c == x )
printf("%d\n", x);
}
}
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