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;

}

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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;

}

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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;

}

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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;

}

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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;

}

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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;

}

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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;

}

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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;

}

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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;

}

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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;

}

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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;

}

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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;

}

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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;

}

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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;

}

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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;

}

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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;

}

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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;

}

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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;

}

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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;

}

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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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