例1.2 1.main()) 求两数之和*/ 2.{ 3. int a,b,sum; *定义变量*/ 4. a=123,b=456; 5. sum=a+b; 6. printf("\nsum is %d n",sum); 7.} 运行结果: sum is 579 例1.2 1. main( ) /*求两数之和*/ 2. { 3. int a,b,sum; /*定义变量*/ 4. a=123,b=456; 5. sum=a+b; 6. printf("\nsum is %d\n",sum); 7. } 运行结果: sum is 579