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/* isupper example */
#include <stdio.h>
#include <ctype.h>
int main ()
{
int i=0;
char str[]="Test String.\n";
char c;
while (str[i])
{
c=str[i];
if (isupper(c)) c=tolower(c);
putchar (c);
i++;
}
return 0;
}
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