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Input in C

Inputting an Integer

#include<stdio.h>  // Include the standard input-output library

int main() {
    // Integer input
    int num;  // Integer variable

    // Prompt the user to enter an integer
    printf("Enter an integer: ");
    scanf("%d", &num);

    // Print the entered integer
    printf("You entered: %d\n", num);

    return 0;
}
        

Explanation: This program prompts the user to enter an integer using printf and reads the input using scanf. The entered integer is then printed using printf.

Inputting a Floating-Point Number

#include<stdio.h>  // Include the standard input-output library

int main() {
    // Floating-point input
    float fnum;  // Floating-point variable

    // Prompt the user to enter a floating-point number
    printf("Enter a floating-point number: ");
    scanf("%f", &fnum);

    // Print the entered floating-point number
    printf("You entered: %.2f\n", fnum);

    return 0;
}
        

Explanation: This program prompts the user to enter a floating-point number using printf and reads the input using scanf. The entered number is then printed using printf with 2 decimal places.

Inputting a Double

#include<stdio.h>  // Include the standard input-output library

int main() {
    // Double input
    double dnum;  // Double variable

    // Prompt the user to enter a double
    printf("Enter a double: ");
    scanf("%lf", &dnum);

    // Print the entered double
    printf("You entered: %.10f\n", dnum);

    return 0;
}
        

Explanation: This program prompts the user to enter a double using printf and reads the input using scanf. The entered double is then printed using printf with 10 decimal places.

Inputting a Character

#include<stdio.h>  // Include the standard input-output library

int main() {
    // Character input
    char ch;  // Character variable

    // Prompt the user to enter a character
    printf("Enter a character: ");
    scanf(" %c", &ch);

    // Print the entered character
    printf("You entered: %c\n", ch);

    return 0;
}
        

Explanation: This program prompts the user to enter a character using printf and reads the input using scanf. The entered character is then printed using printf.

Inputting a String

#include<stdio.h>  // Include the standard input-output library

int main() {
    // String input
    char str[100];  // String variable (character array)

    // Prompt the user to enter a string
    printf("Enter a string: ");
    scanf("%s", str);

    // Print the entered string
    printf("You entered: %s\n", str);

    return 0;
}
        

Explanation: This program prompts the user to enter a string using printf and reads the input using scanf. The entered string is then printed using printf.

Explanation:

This HTML document contains several simple C programs with syntax highlighting using CSS. Each section demonstrates a different method of input in C:

• Inputting an Integer: Uses scanf to read an integer input from the user.
• Inputting a Floating-Point Number: Uses scanf to read a floating-point number input from the user.
• Inputting a Double: Uses scanf to read a double-precision floating-point number input from the user.
• Inputting a Character: Uses scanf to read a single character input from the user.
• Inputting a String: Uses scanf to read a string input from the user.