06. Decision Making

if/else, else-if ladder, switch — detailed + live

Goals:

Condition true hone pe code chalana
else-if ladder
switch-case

1. if / else — simple soch

“Agar marks 90 se zyada → Grade A, warna …” — yahi decision-making hai.

Syntax:

if (condition) {
  // true hone pe
} else {
  // false hone pe
}

Live practice 1 — Grade system

marks ki value badal-badal ke grades dekho.

#include <cstdio>

int main() {
    int marks = 78;
    printf("Marks = %d\n", marks);
    if (marks >= 90) {
        printf("Grade A\n");
    } else if (marks >= 60) {
        printf("Grade B\n");
    } else {
        printf("Keep practicing\n");
    }
    return 0;
}

Live practice 2 — switch day

day 1–3 try karo.

#include <cstdio>

int main() {
    int day = 3;
    switch (day) {
        case 1: printf("Monday\n"); break;
        case 2: printf("Tuesday\n"); break;
        case 3: printf("Wednesday\n"); break;
        default: printf("Other day\n"); break;
    }
    return 0;
}

break na ho to next case bhi chal sakta hai (fall-through) — beginners ke liye almost hamesha break likho.

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