09. Arrays

List of values, index 0, loop, bounds warning

Goals:

Array declare + initialize
Index 0-based
Loop se print/sum

1. Array = continuous boxes

int a[5] = 5 ints ek saath.
Pehla element a[0], last a[4].

Technical: memory me side-by-side store. C bounds automatically check nahi karta — galat index = undefined behavior risk.

Live practice 1 — Print array

Values change karke Run.

#include <cstdio>

int main() {
    int a[5] = {10, 20, 30, 40, 50};
    for (int i = 0; i < 5; i++) {
        printf("a[%d] = %d\n", i, a[i]);
    }
    return 0;
}

Live practice 2 — Sum of array

Sum logic samjho.

#include <cstdio>

int main() {
    int a[4] = {5, 10, 15, 20};
    int sum = 0;
    for (int i = 0; i < 4; i++) {
        sum = sum + a[i];
    }
    printf("Sum = %d\n", sum);
    return 0;
}

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