C Exercises: Find the prime numbers within a range of numbers

C For Loop: Exercise-34 with Solution

Write a program in C to find the prime numbers within a range of numbers.

Sample Solution:

C Code:

#include <stdio.h>

void main(){
    int num,i,ctr,stno,enno;

    printf("Input starting number of range: ");
    scanf("%d",&stno);

    printf("Input ending number of range : ");
    scanf("%d",&enno);
    printf("The prime numbers between %d and %d are : \n",stno,enno);
  
    for(num = stno;num<=enno;num++)
       {
         ctr = 0;

         for(i=2;i<=num/2;i++)
            {
             if(num%i==0){
                 ctr++;
                 break;
             }
        }
        
         if(ctr==0 && num!= 1)
             printf("%d ",num);
    }
printf("\n");  
}

Sample Output:

Input starting number of range: 1                                                                             
Input ending number of range : 50                                                                             
The prime numbers between 1 and 50 are :                                                                      
2 3 5 7 11 13 17 19 23 29 31 37 41 43 47  

Flowchart:

C Programming Code Editor:

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