How to write a C Program to Print Prime Numbers from 1 to 100 or Minimum to maximum. Or, prime Numbers within a specific range, and some of the prime numbers within a range using For Loop and While Loop.

## C Program to Print Prime Numbers from 1 to 100 Using For Loop

In this program to print Prime Numbers between 1 to 100, the first For Loop will make sure that the number is between 1 and 100 in C.

**TIP:** We already explained the logic to check whether the given is prime or not in C Program to Find Prime Number article in C Programming.

/* C Program to Print Prime Numbers between 1 to 100 using For Loop */ #include <stdio.h> int main() { int i, Number, count; printf(" Prime Number from 1 to 100 are: \n"); for(Number = 1; Number <= 100; Number++) { count = 0; for (i = 2; i <= Number/2; i++) { if(Number%i == 0) { count++; break; } } if(count == 0 && Number != 1 ) { printf(" %d ", Number); } } return 0; }

**OUTPUT**

## C Program to Print Prime Numbers from 1 to 100 Using While Loop

In this C program to return prime numbers from 1 to 100, we just replaced the For Loop in the above example with a While loop. If you don’t understand the While Loop, please refer While Loop article here: WHILE LOOP

/* C Program to Print Prime Numbers from 1 to 100 using While Loop */ #include <stdio.h> int main() { int i, Number = 1, count; printf(" Prime Number from 1 to 100 are: \n"); while(Number <= 100) { count = 0; i = 2; while(i <= Number/2) { if(Number%i == 0) { count++; break; } i++; } if(count == 0 && Number != 1 ) { printf(" %d ", Number); } Number++; } return 0; }

**OUTPUT**

## C Program to Print Prime Numbers from 1 to N Using For Loop

Instead of printing prime numbers from 1 to 100, you can allow the user to decide the minimum and maximum values.

This program allows the user to enter Minimum and Maximum values — next, this C program prints prime numbers between Minimum and Maximum values using For Loop.

/* C Program to Print Prime Numbers from 1 to n using For Loop */ #include <stdio.h> int main() { int i, Number, count, Minimum, Maximum; printf("\n Please Enter the Minimum & Maximum Values\n"); scanf("%d %d", &Minimum, &Maximum); printf("Prime Numbers Between %d and %d are:\n", Minimum, Maximum); for(Number = Minimum; Number <= Maximum; Number++) { count = 0; for (i = 2; i <= Number/2; i++) { if(Number%i == 0) { count++; break; } } if(count == 0 && Number != 1 ) { printf(" %d ", Number); } } return 0; }

**OUTPUT**

## C Program to Print Prime Numbers from 1 to N Using While Loop

This program to print prime numbers from 1 to 100 is the same as above, but we replaced the For loop with While Loop.

/* C Program to Print Prime Numbers from 1 to N using While Loop */ #include <stdio.h> int main() { int i, Number, count, Minimum, Maximum; printf("\n Please Enter the Minimum & Maximum Values\n"); scanf("%d %d", &Minimum, &Maximum); Number = Minimum; printf("Prime Numbers Between %d and %d are:\n", Minimum, Maximum); while(Number <= Maximum) { count = 0; i = 2; while(i <= Number/2) { if(Number%i == 0) { count++; break; } i++; } if(count == 0 && Number != 1 ) { printf(" %d ", Number); } Number++; } return 0; }

**OUTPUT**

## C Program to calculate Sum of Prime Numbers from 1 to 100

This program finds prime numbers from 1 and 100. Next, it is going to add those numbers to find the sum of all prime numbers between 1 and 100 in C.

/* C Program to find Sum of Prime Numbers Between 1 to 100 */ #include <stdio.h> int main() { int i, Number, count, Sum = 0; for(Number = 1; Number <= 100; Number++) { count = 0; for (i = 2; i <= Number/2; i++) { if(Number%i == 0) { count++; break; } } if(count == 0 && Number != 1 ) { Sum = Sum + Number; } } printf(" Sum of Prime Numbers between 1 to 100 = %d", Sum); return 0; }

**OUTPUT**

## C Program to find Sum of Prime Numbers from 1 to N

Instead of adding prime numbers from 1 to 100, you can allow the user to decide the minimum and maximum values.

This program allows the user to enter Minimum and Maximum values. Next, this C program finds the sum of prime numbers between Minimum and Maximum values using For Loop.

/* C Program to Print Sum of Prime Numbers from 1 to 100 */ #include <stdio.h> int main() { int i, Number, count, Sum = 0, Minimum, Maximum; printf("\n Please Enter the Minimum & Maximum Values\n"); scanf("%d %d", &Minimum, &Maximum); for(Number = Minimum; Number <= Maximum; Number++) { count = 0; for (i = 2; i <= Number/2; i++) { if(Number%i == 0) { count++; break; } } if(count == 0 && Number != 1 ) { Sum = Sum + Number; } } printf(" Sum of Prime Numbers between %d and %d = %d", Minimum, Maximum, Sum); return 0; }

**OUTPUT**