C Reference Convert to upper case: toupper()
The function toupper() returns a uppercase character of the character that is put in.
toupper() source code example:
#include<stdio.h>
#include<ctype.h>
int main()
{
int counter=0;
char mychar;
char str[]="TeSt THis seNTeNce.\n";
while (str[counter])
{
mychar=str[counter];
putchar (toupper(mychar));
counter++;
}
return 0;
}
Note: the sentence will be converted to all uppercase letters.
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