C

# Learn to print all prime number between two given number in C language

In this article, you’ll learn how to print all prime number between two given number in C language without giving input from the keyboard or giving input from the keyboard.

Q: what is the prime number

Ans: A natural number which only divided by itself and 1 is called a prime number and you also say that a prime number is a natural number which is greater than 1 and cannot be formed by multiplying two natural number.

• 1 is not a prime number.
• 2 is the smallest prime number and only even prime number.
• Example of prime number 2,3,5,7,11,13 etc.

To print all prime number between two given number we generally use the following steps:

• First, we take two number then add 1 in the first number and subtract 1 in the second number to check prime number between two intervals number.
• We use two for loop first, for loop for checking all number between the intervals and second for loop to check prime number.
• If second for loop is true, then it means the number is not a prime number and increments the number check again
• If second for loop is false, then it checks again
• if(i==x) then it a prime number and check again for the first for loop.

Example 1: write a program in C language to print all prime number between two given number, without input from keyboard

 #include #include int main() {   int f1=1,f2=50,x,i;   for(x=f1+1;x<=f2-1;x++){        for(i=2;i

 The Output of this program: 2 3 5 7 11 13 17 19 23 29 31 37 41 43 47

Example 2: write a program in C language to print all prime number between two given number, with input from the keyboard

Solution:

 #include #include int main() {   int f1,f2,x,i;   printf(“Enter first number: “);   scanf(“%d”,&f1);   printf(“Enter second number: ” );   scanf(“%d”,&f2);   for(x=f1+1;x<=f2-1;x++){        for(i=2;i

 The Output of this program: Enter first number: 5 Enter second number: 100 7 11 13 17 19 23 29 31 37 41 43 47 53 59 61 67 71 73 79 83 89 97

Example 3: write a program in C language to print all prime number including two given number, with input from keyboard Solution:

 #include #include int main() {   int f1,f2,x,i;   printf(“Enter first number: “);   scanf(“%d”,&f1);   printf(“Enter second number: ” );   scanf(“%d”,&f2);   for(x=f1;x<=f2;x++){        for(i=2;i

 The output of this program: Enter first number: 2 Enter second number: 17 2 3 5 7 11 13 17

Program to check prime number in C language