Chapter 4 Codes Grade 7 CS

🧮 Program 1: Check Positive or Negative Number

#include <stdio.h>

int main() {
    int number;

    printf("Enter a number: ");
    scanf("%d", &number);

    if (number > 0) {
        printf("The number is positive.\n");
        printf("Thank you!\n");
    } 
    else if (number < 0) {
        printf("The number is negative.\n");
        printf("Program terminated.\n");
    } 
    else {
        printf("The number is zero.\n");
    }

    return 0;
}

---

👶👨‍🦳 Program 2: Age Category

#include <stdio.h>

int main() {
    int age;

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

    if (age >= 79) {
        printf("You are very old.\n");
    }
    else if (age >= 68) {
        printf("You are old.\n");
    }
    else if (age >= 45) {
        printf("You are middle-aged.\n");
    }
    else if (age >= 18) {
        printf("You are young.\n");
    }
    else {
        printf("You are a child.\n");
    }

    return 0;
}

---

🔤 Program 3: Alphabet Meaning (Using switch case)

#include <stdio.h>

int main() {
    char letter;

    printf("Enter an alphabet (A or S): ");
    scanf(" %c", &letter); // space before %c to skip any leftover newline

    switch (letter) {
        case 'A':
        case 'a':
            printf("A - An apple a day keeps the doctor away.\n");
            break;

        case 'S':
        case 's':
            printf("S - Super!\n");
            break;

        default:
            printf("Invalid alphabet! Please enter A or S.\n");
    }

    return 0;
}