Question

How to use toupper() function to convert lowercase letter to uppercase in C

Answer 1

#include <stdio.h>
#include <ctype.h>
 
int main(void)
{
    char s[] = "The last line of code";
	int i;
	
	while (s[i])
	{
		putchar(toupper(s[i]));
		i++;
	}
	
    return 0;
}
 
  
/*
    
run:
    
THE LAST LINE OF CODE

*/

 

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Answer 2

#include <stdio.h>
#include <ctype.h>
 
int main(void)
{
    char s[] = "The last line of code";
	int i;
	
	while (s[i])
	{
		s[i] = toupper(s[i]);
		i++;
	}
	
	puts(s);
    return 0;
}
 
  
/*
    
run:
    
THE LAST LINE OF CODE

*/

 

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