31 lines
723 B
C
31 lines
723 B
C
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/*
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* C program to check whether a given number is prime or not
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* and output the given number with suitable message.
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*/
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#include <stdio.h>
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#include <stdlib.h>
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void main()
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{
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int num, j, flag;
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printf("Enter a number \n");
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scanf("%d", &num);
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if (num <= 1)
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{
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printf("%d is not a prime numbers \n", num);
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exit(1);
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}
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flag = 0;
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for (j = 2; j <= num / 2; j++)
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{
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if ((num % j) == 0)
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{
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flag = 1;
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break;
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}
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}
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if (flag == 0)
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printf("%d is a prime number \n", num);
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else
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printf("%d is not a prime number \n", num);
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}
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