Program for doing upercase of 1st letter of string?

#include<stdio.h>

#include<conio.h>

#include<ctype.h>

main()

{

char string[80];

int n,k=0;

clrscr();

while((string[k]=getche())!='\r')

k++;

string[k]='\0';

n=k;

k=0;

while(k<n)

{

putchar(toupper(string[k]));

k++;

}

}