c语言精彩编程百例的源代码

				# include 
				
				void  main()
				{
					/* 说明本文件将要使用其它文件中的函数 */
					extern int multiply();
					extern int sum();
				
				    int a, b;
					int result;
					printf("Please input a and b: ");
					scanf("%d, %d", &a, &b);
					result = multiply(a, b);
					printf("The result of multiply is: %d", result);
					result = sum(a, b);
					printf("\nThe result of sum is: %d\n", result);
				
				}