In C language, getchar() is a standard library function used to read a single character from the standard input (keyboard).

Usage of getchar()

#include <stdio.h>



int main() {

    char ch;

    printf("Enter a character: ");

    ch = getchar();  // Reads a single character

    printf("You entered: %c\n", ch);

    return 0;

}

Why Not the Other Options?

• (A) putchar() → Outputs (prints) a single character, does not read.
• (B) printf() → Prints formatted output, does not read characters.
• (D) write() → A low-level system call, not a standard library function for character input.

Thus, (C) getchar() is the correct answer!