includeint main() {printf("Hello World!\n");return 0;}
includeint main() {int num1, num2, sum;printf("请输入两个整数:");scanf("%d %d", &num1, &num2);sum = num1 + num2;printf("两个整数的和为:%d\);} else {printf("%d 不是一个正数。\n", num);}return 0;}
includeint main() {char ch;printf("请输入一个字符:");scanf(" %c", &ch);if (ch == 'a' || ch == 'e' || ch == 'i' || ch == 'o' || ch == 'u') {printf("%c 是一个元音。\n", ch);} else {printf("%c 不是一个元音。\n", ch);}return 0;}
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