C String lowercase

In this section, you will study how to convert the string to lowercase. You
can see in the given example, we have define a string in uppercase characters.
Therefore, in order to convert the characters in lowercase (a to z), we have
used the library function tolower() provided by the header file <ctype.h>.
<ctype.h> - This header file is used for testing
and converting characters.
Here is the code:
STRINGLO.C
#include <ctype.h>
#include <stdio.h>
#include <conio.h>
void main() {
char st[40]="HELLO WORLD";
int i;
for (i = 0; st[i]; i++)
st[i] = tolower(st[ i ]);
printf("The lowercase of String= %s\n", st);
getch();
}
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Output will be displayed as:
STRINGLO.EXE

Download Source code:

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