30 Elementary school students arithmetic problem-C + + programming

Software Engineering Section, the teacher through an example of what is the program, program and software differences, require us to write a short time a programming problem,

The topic is to write 30 pupils arithmetic questions. Here is the source code:

#include <iostream.h>
#include <stdlib.h>
#include <time.h>
void demo (void)  // Randomly generated arithmetic
{
 int m,n,k;  //random number M,n, Count
 
 m=rand ()%100;//generate random number
 n= Rand ()%100;
 k=rand ()%5;
 switch (k)    //Four operations random selection
 {
 case 1:cout<<m<< "+" <<n << "=" <<endl;break;
 case 2:cout<<m<< "-" <<n<< "=" <<endl;break;
 case 3:cout<<m<< "x" <<n<< "=" <<endl;break;
 case 4:cout<<m<< "÷" <<n<< "=" <<endl;break;
 }
}
int main ()    //main function for cycle times
{
 int i=1;   //Cycles
 srand (( unsigned) time (NULL));//generate different random seeds for the rand () function
 cout<< "30 100 Subtraction Arithmetic:" <<ENDL;
 while (i<=38)
 {
  demo (); //Call function
  i++;
 }
 return 0;
}

Code results:

Thought: The demo function is used to generate the immediate operation, and the main function is used to control the number of meta-calculations.

30 Elementary school students arithmetic problem-C + + programming