Taking Input from User

scanf() function : scanf() is one of the commonly used function to take input from the user, to read the input data from the console.

Example :

1. Write a C program to take input from user and print it.

Code :

 #include <stdio.h>

 int main() {

    int val;

    printf("Enter value of val:");
    scanf("%d",&val);

    printf("Output is %d",val);

    return 0;
}

⚙️ Output :

Enter value of val:10
Output is 10

In the above example, val is a variable we can store values in variable. printf() function is the print the given string message to the console. In this case, it asks the user to enter the value of val. The scanf() function is used to read input from the user. %d is the format specifier used to read an integer value and &val is the address of the variable val where the entered value will be stored. printf() is used to display the output to the console. It prints the value of val using the format specifier %d.

2. Write a C program to calculate Sum of two numbers.

Code :

 #include <stdio.h>

 int main() {

     int num1;
     int num2;
     int sum;

     printf("Enter Value of num1 :");
     scanf("%d",&num1);

     printf("Enter Value of num2 :");
     scanf("%d",&num2);

     sum = num1 + num2;

     printf("Sum:%d",sum);

    return 0;
}

⚙️ Output :

Enter Value of num1 :20
Enter Value of num2 :30
Sum:50

In the above example, num1, num2 and sum is a variable we can store values in a variable.printf() function is print the given string message to the console. It asks the user to enter the value of num1 and num2.The scanf() function is used to read input from the user. %d is the format specifier used to read an integer value &num1 and num2 is the address of the variable num1 and num2 where the entered value will be stored.printf() is used to display the output to the console. It prints the value of sum using the format specifier %d. Output is Sum : 50.

3. Write a C program to calculate the sum of two numbers.

Code :

 #include <stdio.h>

 int main() {
    int num1, num2;

    printf("Enter value of num1 :");
    scanf("%d",&num1);

    printf("Enter value of num1 :");
    scanf("%d",&num2);

    int sum = num1 + num2;
    printf("Sum of num1 and num2 :%d",sum);

    return 0;
}

⚙️ Output :

Enter value of num1 : 30
Enter value of num1 : 10
Sum of num1 and num2 : 40

4. Write a C program to print input marks of 3 subjects.

Code :

#include <stdio.h>

int main() {
   int marathi,hindi,english;

   printf("Enter marks of Marathi :");
   scanf("%d", &marathi);

    printf("Enter marks of Hindi :");
   scanf("%d", &hindi);

    printf("Enter marks of English :");
   scanf("%d", &english);

   printf("M=%d H=%d E=%d",marathi,hindi,english);

    return 0;
}

⚙️ Output :

Enter marks of Marathi :75
Enter marks of Hindi :85
Enter marks of English :70
M=75 H=85 E=70

5. Write a c program to print input marks of 3 subjects.

Code :

#include <stdio.h>

int main() {
   int marathi,hindi,english;

   printf("Enter marks of Marathi ,Hindi,and English :");
   scanf("%d%d%d", &marathi,&hindi,&english);


   printf("M=%d H=%d E=%d",marathi,hindi,english);

    return 0;
}

⚙️ Output :

Enter marks of Marathi ,Hindi and English :75 85 70 M=75 H=85 E=70

6. Write a C program to take input from user and print sum and percentage.

Code :

#include <stdio.h>

int main() {
   int marathi,hindi,english;

   printf("Enter marks of Marathi ,Hindi,and English :");
   scanf("%d%d%d", &marathi,&hindi,&english);

   int sum = (marathi + hindi + english );

   int per =sum/3;
   char p ='%';

   printf("Sum=%d,Percentage=%d %c",sum,per,p);

    return 0;
}

⚙️ Output :

Enter marks of Marathi ,Hindi,and English :75 85 70
Sum=230,Percentage=76 %

7. Write a C program to calculate Simple Interest.

Code :

#include <stdio.h>

int main() {

    float p,r,t,si;

    printf("Enter Principle,Rate and Time : ");
    scanf("%f%f%f", &p,&r,&t);

    si=(p*r*t)/100;

    printf("Simple Interest :%f",si);
    printf("\nPayable Amount:%f",p+si);

    return 0;
}

⚙️ Output :

Enter Principle,Rate and Time : 5000 300 2 Simple Interest :30000.000000 Payable Amount :35000.000000

8. Write a C Program to convert temperature from celsius to fahrenheit

Code :

#include <stdio.h>

int main() {

   float f,c;

   printf("Enter Temperature in Celsius :");
   scanf("%f",&c);

   f=1.8*c+32;

   printf("Temperature in Fahrenheit =%f",f);

    return 0;
}

⚙️ Output :

Enter Temperature in Celsius :36 Temperature in Fahrenheit =96.800003