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#include <stdio.h> int main(void) { /* for loop — counting up */ printf("for: "); for (int i = 0; i < 5; i++) { printf("%d ", i); } printf(" "); /* for loop — counting down */ printf("reverse: "); for (int i = 4; i >= 0; i--) { printf("%d ", i); } printf(" "); /* while loop */ int n = 1; printf("while powers of 2: "); while (n <= 64) { printf("%d ", n); n *= 2; } printf(" "); /* do-while — body runs at least once */ int input; do { printf("Enter 1-10: "); scanf("%d", &input); } while (input < 1 || input > 10); printf("Valid input: %d ", input); /* break and continue */ printf("skip evens, stop at 9: "); for (int i = 0; i < 15; i++) { if (i % 2 == 0) continue; if (i == 9) break; printf("%d ", i); } printf(" "); return 0; }
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