Change string case using its pointer : String Case « String « C / ANSI-C

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C / ANSI-C » String » String Case Screenshots  Change string case using its pointer    #include <ctype.h> #include <stdio.h> int main(void) {   char str[80], *p;   printf("Enter a string: ");   gets(str);   p = str;   while( *p ) {     *p = toupper(*p);     p++;   }   printf("%s\n", str); /* uppercase string */   p = str; /* reset p */   while( *p ) {     *p = tolower(*p);     p++;   }   printf("%s\n", str); /* lowercase string */   return 0; }                     Related examples in the same category 1. Convert string to upper case and lower case