code to convert small alphabets to large or large to small

//Returning a value:
#include"stdio.h"
#include"conio.h"
//Decliration
void small(char&);
void cap(char&);
char ch1,ch2;
void main()
{
    printf("Press any Alphabet\n");
    ch1=getche();
     small(ch1);
    printf("\nSmall alphabet is %c\n",ch1);
    printf("\n\n");
    printf("Press any Alphabet\n");
    ch2=getche();
     cap(ch2);
    printf("\nCapital alphabet is %c",ch2);

    getch();
}
//Defination
void small(char &x)
{
    if(x>=65&&x<=90)
        x=x+32;
   
}
//Defination
void cap(char &x)
{
    if(x>=97&&x<=132)
        x=x-32;
   
}

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