Convert string to upper case and lower case : String Case « String « C / ANSI-C

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

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