1 //第二题
 2 
 3 #include <stdio.h>
 4 
 5 int main (void){
 6     printf ("In C,lowercase letters are significant.\n");
 7     printf ("main is where program execution begins.\n");
 8     printf ("Opening and closing braces enclose program statements in a routine.\n");
 9     printf ("All program statements must be terminated by a semicolon.\n");
10              
11     return 0;
12 }

 

 1 //第四题
 2 
 3 #include <stdio.h>
 4 
 5 int main (void){
 6     int sum;
 7     
 8     printf ("87 - 15 = %i\n", 87 - 15);
 9              
10     return 0;
11 }