## INDEX

### Check given number is prime number or not using c program

Definition of prime number:

A natural number greater than one has not any other divisors except 1 and itself. In other word we can say which has only two divisors 1 and number itself. For example: 5

Their divisors are 1 and 5.

Note: 2 is only even prime number.

Logic for prime number in c

We will take a loop and divide number from 2 to number/2. If the number is not divisible by any of the numbers then we will print it as prime number.

Example of prime numbers : 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, 101, 103, 107, 109, 113, 127, 131, 137, 139, 149, 151, 157, 163, 167, 173, 179, 181, 191, 193, 197, 199 etc.

Code 1:
1. C program to determine prime number
2. Determining if a number is prime in c
3. C program to find given number is prime or not

#include<stdio.h>

int main(){

int num,i,count=0;
printf("Enter a number: ");
scanf("%d",&num);
for(i=2;i<=num/2;i++){
if(num%i==0){
count++;
break;
}
}
if(count==0 && num!= 1)
printf("%d is a prime number",num);
else
printf("%d is not a prime number",num);
return 0;
}

Sample output:
Enter a number: 5
5 is a prime number

Code 2:
1. C program for prime numbers between 1 to 100
2. How to find prime numbers from 1 to 100 in c
3. How to print prime numbers from 1 to 100 in c

#include<stdio.h>

int main(){
int num,i,count;

for(num = 1;num<=100;num++){
count = 0;

for(i=2;i<=num/2;i++){
if(num%i==0){
count++;
break;
}
}

if(count==0 && num!= 1)
printf("%d ",num);
}

return 0;
}

Output:
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

Code 3:
1. C program for prime numbers between 1 to n
2. C program to find prime numbers up to n
3. C program to list prime numbers
4. Write a c program to generate n prime numbers
5. C program to find n prime numbers

#include<stdio.h>

int main(){

int num,i,count,n;
printf("Enter max range: ");
scanf("%d",&n);

for(num = 1;num<=n;num++){

count = 0;

for(i=2;i<=num/2;i++){
if(num%i==0){
count++;
break;
}
}

if(count==0 && num!= 1)
printf("%d ",num);
}

return 0;
}

Sample output:
Enter max range: 50
2 3 5 7 11 13 17 19 23 29 31 37 41 43 47

Code 4:
1. C program to find prime numbers using while loop
2. Wap to find prime numbers in c
3. Write a c program to generate prime number
4. How to get prime numbers in c

#include<stdio.h>

int main(){

int num,i,count,min,max;

printf("Enter min range: ");
scanf("%d",&min);

printf("Enter max range: ");
scanf("%d",&max);

num = min;
while(num<=max){

count = 0;
i=2;

while(i<=num/2){
if(num%i==0){
count++;
break;
}
i++;
}

if(count==0 && num!= 1)
printf("%d ",num);

num++;
}

return 0;
}

Sample output:
Enter min range: 50
Enter max range: 100
53 59 61 67 71 73 79 83 89 97

Code 5:
1. How to find out prime numbers in c programming
2. Display prime numbers in c
3. C program to find prime numbers between two numbers
4. C code to display prime numbers within a range

#include<stdio.h>

int main(){

int num,i,count,min,max;

printf("Enter min range: ");
scanf("%d",&min);

printf("Enter max range: ");
scanf("%d",&max);

for(num = min;num<=max;num++){

count = 0;

for(i=2;i<=num/2;i++){
if(num%i==0){
count++;
break;
}
}

if(count==0 && num!= 1)
printf("%d ",num);
}

return 0;
}

Sample output:
Enter min range: 10
Enter max range: 50
11 13 17 19 23 29 31 37 41 43 47

Code 6:
1. Sum of prime numbers from 1 to 100 in c

#include<stdio.h>

int main(){

int num,i,count,sum=0;

for(num = 1;num<=100;num++){

count = 0;

for(i=2;i<=num/2;i++){
if(num%i==0){
count++;
break;
}
}

if(count==0 && num!= 1)
sum = sum + num;
}

printf("Sum of prime numbers is: %d ",sum);

return 0;
}

Output:
Sum of prime numbers is: 1060

Code 7:
1. C program to find sum of prime numbers

#include<stdio.h>

int main(){

int num,i,count,min,max,sum=0;

printf("Enter min range: ");
scanf("%d",&min);

printf("Enter max range: ");
scanf("%d",&max);

for(num = min;num<=max;num++){

count = 0;

for(i=2;i<=num/2;i++){
if(num%i==0){
count++;
break;
}
}

if(count==0 && num!= 1)
sum = sum + num;
}

printf("Sum of prime numbers is: %d ",sum);

return 0;
}

Sample output:
Enter min range: 50
Enter max range: 100

1. Write a c program to check given number is perfect number or not.
Sum of prime numbers is: 732

10. Write a c program to add two numbers without using addition operator.
11. Write a c program to subtract two numbers without using subtraction operator.
15. Write a c program to solve quadratic equation.
18. Write a c program which passes structure to function.
28. Write a c program which takes password from user.
29. Write a scanf function in c which accept sentence from user.
30. Write a scanf function in c which accept paragraph from user.