Top 10 simplest programs of C language

List 10 basic problem of C Programming:

Top 10 simplest programs of C language

1. Write a program to Print "hello world".

#include<stdio.h>
int main()
{
    printf("Hello world!");
    return 0;
}

Result:- Hello world!

2. Write a program to add two Numbers from the user.

#include<stdio.h>
int main()
{
    int a,b,sum;
    printf("Enter first number:\n ");
    scanf("%d",&a);
    printf("Enter second number:\n ");
    scanf("%d",&b);
    printf("\n\n");
    sum=a+b;
    printf("sum of %d and %d :\n %d ",a,b,sum);
    return 0;
}

Result:- Enter first number: 5

              Enter second number: 6

              sum of 5 and 6. 11

3. Write a program to take input from user and find remainder and quotient.

#include<stdio.h>
int main(){
    int a,b,quotient,remainder;
    printf("Enter Dividend:\n");
    scanf("%d",&a);
    printf("Enter Divisor:\n");
    scanf("%d",&b);

    quotient=a/b;
    remainder= a % b;
    printf("\n\n");
    printf("the quotient of %d divided by %d is %d \n ",a,b,quotient);
    printf("\n and the remainder is:%d \n\n",remainder);

return 0;
}

Result:- Enter Dividend: 6

              Enter Divisor: 2

              the quotient of 6 divided by 2 is 3 and the remainder is:0

4.Write a program to convert Celsius to Fahrenheit.

#include<stdio.h>
int main(){ 
  float c,f;
 printf("Enter Celsius: ");
 scanf("%f",&c);
  
   f = (c*9/5)+ 32;
    printf("fahrenheit : %f",f);
    return 0;
}

Result:- Enter Celsius: 36 

               Fahrenheit : 96.800003

5. Write a program to find simple interest.

#include<stdio.h>
int main()
{ float P,R,T,SI,Am;
    printf("Enter Principal Value: ");
    scanf("%f",&P);
    printf("Enter Rate: ");
    scanf("%f",&R);
    printf("Enter Time: ");
    scanf("%f",&T);
    
  SI = P*R*T/100;
    printf("Simpal intrest: %f\n\n", SI);
    Am=P+SI;
    printf("full amount:%f",Am);
    return 0;
}

Result:- Enter Principal Value: 500

               Enter Rate: 6

               Enter Time: 5

               Simple interest: 150.000000

               full amount:650.000000

6. Write a program to find area of triangle.

#include<stdio.h>
int main()
{ 
 float Ar,b,h;
  printf("Enter base:\n ");
  scanf("%f",&b);
  printf("Enter height:\n ");
  scanf("%f",&h);
  Ar= b*h/2;
    printf("area of triangle is:\n %f", Ar);
    return 0;
}

Result:- Enter base: 6

               Enter height: 7

               area of triangle is: 21.000000

7. Write a program to check Even or odd number.

#include<stdio.h>
int main()
{ int a;
    printf("Enter a number:\n");
    scanf("%d",&a);
    if(a%2==0)
        printf("Number is Even");
        
    else
        printf("Number is odd");
        
    return 0;
}

Result:- Enter a number: 5

               Number is odd

8. Write a program to find greater in two numbers.

#include<stdio.h>
int main()
{
  int a, b;
  printf("Enter first number:\n");
  scanf("%d",&a);
  printf("Enter second number:\n");
  scanf("%d",&b);
  
  if(a<b)
  printf("Second is greater");
  else 
  printf("first is greater");
    
    return 0;
}

Result :- Enter first number: 5

               Enter second number: 8

               First is greater

9. Write a program to check positive and negative number.

#include<stdio.h>
int main()
{
    int a;
    printf("Enter a number\n");
    scanf("%d",&a);
    if(a<0)
        printf("%d is negative number",a);

    else
        printf("%d is positive number",a);

    return 0;
}

Result:- Enter a number: -9

              -9 is negative number

10. Write a program to check leap year.

#include<stdio.h>
int main()
{ int a;
    printf("Enter a year: \n");
    scanf("%d",&a);
    printf("\n");
    if((a%4==0&&a%100!=0)||a%400==0)
        printf("year %d is a leap year", a);
    else printf("year %d is not a leap year",a);
    return 0;
}

Result:- Enter a year: 2025

               year 2025 is not a leap year