C User Input

Read input with scanf and fgets.

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scanf("%d", &age); reads a number. The & passes the variable's address.
scanf("%s", name); reads one word (it stops at a space).
fgets(line, sizeof line, stdin); reads a whole line safely, including spaces.

Key Takeaways: C User Input

Mastering C User Input helps you write clean and reliable C code. Follow standard conventions, test edge cases, and keep logic simple. Try running the code example below and complete the exercises to build confidence.

C User Input Code Example

#include <stdio.h>
#include <string.h>

int main() {
    char name[50];
    int age;

    printf("Your full name: ");
    fgets(name, sizeof name, stdin);
    name[strcspn(name, "\n")] = '\0';   // remove the newline

    printf("Your age: ");
    scanf("%d", &age);

    printf("Hello %s, next year you will be %d.\n", name, age + 1);
    return 0;
}

Output

Your full name: Ali Khan
Your age: 25
Hello Ali Khan, next year you will be 26.

Run this example on your own computer. The "Get Started" lesson shows how to set it up.

C User Input Practice Exercises

Check what you learned in “C User Input”.

/ 2 solved

Fill in the blank

Read a number into age. Note the address-of operator.

scanf("%d", age);

✓ Correct! Not quite. Try again.

Multiple choice

Which function safely reads a whole line including spaces?

fgets() scanf("%s") getline_c() gets_safe()

✓ Correct! Not quite. Try again.

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C User Input

💡 Key Takeaways: C User Input

C User Input Code Example

C User Input Practice Exercises

Key Takeaways: C User Input