Use scanf to read in multiple numbers. int n1, n2, n3; printf("Enter n1 n2 n3\n"); scanf("%d %d %d", &n1, &n2, &n3); printf("%d %d %d\n", n1, n2, n3); Output Enter n1 n2 n3 1 2 3 1 2 3 Output Enter n1 n2 n3 1 3 4 1 3 4