A program reflecting the characteristics of C language program structure

1、 reaction c Program with structural characteristics of language program

#include <stdio.h>         //#include  Used to contain system header files ---- contain c Library function 
void putupper(char ch);    // Declaration of custom functions 
#define SIZE 80            // Defining macro , Represents a constant   
void main()           
{
    char str[SIZE];
    int i;
    gets(str);
    for (i=0;str[i]!='\0';i++)
    {
         putupper(str[i]);
         printf("\n");
    }
}

void putupper(char ch){
    char cc;
    cc=(ch>='a' && ch<='z')? ch+'A'-'a':ch;
    putchar(cc);
}

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