# C Program to find Prime Numbers Between 1 to 100

This C program finds all the prime numbers between 1 to 100. The same logic which was used to find whether given number is prime or not is used in the inner for loop, while the outer for loop iterates from 1 through 100 to give each natural number as input to inner for loop.

# Source Code :

#include<stdio.h> #include<math.h> int main() { int i, j,r; for(i = 2; i <= 100; ++i) // Step 1 { r=1; for(j = 2; j <= sqrt(i); ++j) // Step 2 { r=i%j; if(r == 0) break; } if(r!=0) // Step 3 printf("%d\n", i); } return 0; }

# Sample Test cases :

2 3 5 7 11 13 17 19 23 29 31 37 41 43 47 53 59 61 67 71 73 79 83 89 97

# Explanation:

Step 1: The outer for loop iterates from 1 through 100 giving each natural number as input to inner for loop.

Step 2: The inner for loop determines whether given number is prime or not using remainder concept ( refer prime or not program for better clarification).

Step 3: If the remainder is non-zero then it implies that particular number is prime number and that number is printed to output screen until outer for loop reaches to 100.

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