A program to convert lowercase letters to uppercase letters

/*A program to convert lower case letters to upper case letters*/

#include<stdio.h>

int main()

{

char i,lw,up;

up='A';//up has character A which will be printed as character by %c & ascii value i.e.integer by %d

lw='a';

//printf("%d",lw);

//printf("\n%d",up);

for(i=32;i>5;i--)//

{

lw='a'-i;//a=97 is its ascii value ..so 97-32=65..means ascii value of character A...97-31=66 ascii of B..SO ON

printf("\n[%c]=%d",lw,lw);//value of lw has 65,66,67,68 ..onward upto ASCII of Z=90 ..when i>5 loop stops at 90

//means at Z.........SO PRINTS upper case LETTERS

}

return 0;

}