Thread: Problem with Strings and Conversions

Hi, I have a problem understanding how to convert a string of letters inputted from the user into the function toupper.
ex. input: asdf

output: ASDF

Code:

#include <stdio.h>
#include <ctype.h>
#define SIZE 50

//void ToUpperCase(char, char);

int main (void)
{
int i;
char s1[SIZE];
char s2[SIZE];

printf("Please Enter the First String: ");
scanf("%s", &s1);

printf("\nPlease Enter the Second String: ");
scanf("%s", &s2);

printf("\n");

for (i=0; i<=SIZE; i++)          /*Heres where problem is*/
printf("%s,
isalpha(s1[SIZE]) ? "Is " : "Is not ", "a letter");

//ToUpperCase(s1, s2);

return 0;
}

//void ToUpperCase(char, char){

I don't understand how to get a scanned input into a function such as toupper or isalpha?
Any help is greatly appreciated.!

You need to run through each character in the string converting its case. You can loop through characters until you reach the \0 at which point you want to break it.

How abouts would I do that?
like this...
for (i=0; i<=SIZE; i++)
if (s1[i]?>>>>>?

is this the approach, i understand how i would do this up till this point ?>>>>?

I placed this into my code but it comes out different, it only checks the first letter. I need it to check every letter inputted by the user.

Code:

#include <stdio.h>
#include <ctype.h>
#define SIZE 50

void ToUpperCase(char, char);

int main (void)
{
int i=0;
char s1[SIZE];
char s2[SIZE];
 
printf("Please Enter the First String: ");
scanf("&#37;s", &s1[i]);


printf("\nPlease Enter the Second String: ");
scanf("%s", &s2); 

printf("\n");



for (i=0; s1[i] != ('\0' && i < SIZE); i++)
printf("%c is %s letter", s1[i] , isalpha(s1[i]) ? "a" : "not a ");


 
//ToUpperCase(s1, s2);

return 0;
}

//void ToUpperCase(char, char){

//int i;

//for (i=0; i<=SIZE; i++)
//printf("%s", s1
//isalpha(s1[i]) ? "Is " : "Is not ", "a letter");

I am so confused with this?