Simple program example in c language


Basic simple c  language programs examples for beginners

1
C program to print "hello world".
Code
#include<stdio.h>
int main(){
    printf("Hello world");
    return 0;
}

2
C program to add two numbers in c.
Code
#include<stdio.h>
int main(){
    int a,b,sum;
    scanf("%d %d",&a,&b);
    sum = a + b;
    printf("%d",sum);
    return 0;
}

3
C program to accept a string from users and print it.
Code
#include<stdio.h>
int main(){
    char str[20];
    scanf("%s",&str);
    printf("%s",str);
    return 0;
}

4
C program to check a given number is positive or negative.
Code
#include<stdio.h>
int main(){
    int num;
    scanf("%d",&num);
   
    if(num ==0)
         printf("Number is zero.");
    else if(num > 0)
printf("Number is positive.");
else
printf("Number is negative.");
    return 0;
}

5
C program to swap two numbers.
Code
#include<stdio.h>
int main(){
    int a,b,c;
    scanf("%d %d",&a,&b);
   
    c = a;
    a = b;
    b = c;

    printf("%d %d",a,b);
    return 0;
}

6
C program to find area of a circle.
Code
#include<stdio.h>
int main(){
    floar r,area;
        
    printf("Enter radius of circle: ");
    scanf("%f",&r);

    area = 3.14 * r * r;

    printf("Area of circle is: %f",area);
    return 0;
}

7
C program to print numbers from 1 to 10.
Code
#include<stdio.h>
int main(){

int i;

    for(i=1;i<=10;i++){
        printf("%d ",i);
    }

    return 0;
}

8
C program to print numbers from 1 to 10 in reverse order.
Code
#include<stdio.h>
int main(){

int i;

    for(i=10;i>= 0;i--){
        printf("%d ",i);
    }

    return 0;
}

9
C program to print all even numbers of the given range.
Code
#include<stdio.h>
int main(){

    into min,max;

    printf("Enter min and max even numbers respectively: ");
    scanf("%d %d",&min,&max);

    for(i=min;i<=max;i=i+2){
        printf("%d ",i);
    }

    return 0;
}

10
C program to accept a string and find out total numbers of characters.
Code
#include<stdio.h>
#include<string.h>

int main(){
    char str[20];

    printf("Enter any string: ");
    scanf("%s",&str);
    printf("Length of string: %d",strlen(str));

    return 0;
}

11
C program to add n natural numbers from 1.
Code
#include<stdio.h>
int main(){

int n,sum = 0;

    printf("Enter any positive number: ");
    scanf("%d",&n);

    for(i=1;i<=n;i++){
        sum = sum + 1;
    }

printf("Sum of n numbers: %s",sum);

    return 0;
}

12
C program to get the marks of student and print the average marks.
Code
#include<stdio.h>
int main(){

int n;
float marks, sum = 0;
   
    printf("Enter any total numbers of student: ");
    scanf("%d",&n);

   
    for(i=1;i<=n;i++){
        printf("Enter marks of student %d: ",i);
       scanf("%f",&marks);

       sum = sum + marks;
    }

printf("Average marks: %f",sum/n);

    return 0;
}

13
C program to print the all elements of any array.
Code
#include<stdio.h>
int main(){

int arr[]={1,2,34,56,89};

int i;

    for(i=0;i<5;i++){
        printf("%d ",arr[i]);
    }

    return 0;
}

14
C program to find square root of a number.
Code
#include<stdio.h>
#include<math.h>

int main(){
    int num;
    scanf("%d",&num);

    printf("Square root: %f",sqrt(num));
    return 0;
}

15
C program to find max of two unequal numbers.
Code
#include<stdio.h>
int main(){
    int a,b,max;
    scanf("%d %d",&a,&b);
   
    if(a > b)
         max = a;
    else
         max = b;

    printf("%d",max));
    return 0;
}

16
C program to check given number is even or odd.
Code
#include<stdio.h>

int main(){

    int number;
  
    printf("Enter any integer: ");
    scanf("%d",&number);

    if(number % 2 ==0)
         printf("%d is even number.",number);
    else
         printf("%d is odd number.",number);
  
    return 0;

}

17
Write a c program to print multiplication table.
Code
#include<stdio.h>
int main(){
  int r,i,j,k;
  printf("Enter the number range: ");
  scanf("%d",&r);
  for(i=1;i<=r;i++){
      for(j=1;j<=10;j++)
           printf("%d*%d=%d ",i,j,i*j);
      printf("\n");
  }
  return 0;
}

18
Code to find the ASCII values of given character in c. 
Code
#include<stdio.h>

int main(){
  
    char c;

    printf("Enter any character: ");
    scanf("%c",&c);

    printf("ASCII value of given character: %d",c);
        
    return 0;
}

19
C program to convert upper case to lower case.
Code
#include<stdio.h>
#include<string.h>
int main(){
  char str[20];
  int i;
  printf("Enter any string: ");
  scanf("%s",str);
  printf("The string is: %s",str);
  for(i=0;i<=strlen(str);i++){
      if(str[i]>=65&&str[i]<=90)
       str[i]=str[i]+32;
  }
  printf("\nThe string in uppercase is: %s",str);
  return 0;
}

20
C program to convert lower case to upper case.
Code
#include<stdio.h>
int main(){
  char str[20];
  int i;
  printf("Enter any string: ");
  scanf("%s",str);
  printf("The string is: %s",str);
  for(i=0;i<=strlen(str);i++){
    if(str[i]>=97&&str[i]<=122)
         str[i]=str[i]-32;
  }
  printf("\nThe string in lowercase is: %s",str);
  return 0;
}

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