To Upper C Code Example

Example 1: convert string to uppercase in c

For those of you who want to uppercase a string and store it in a variable (that was what I was looking for when I read these answers).  #include <stdio.h>  //<-- You need this to use printf. #include <string.h>  //<-- You need this to use string and strlen() function. #include <ctype.h>  //<-- You need this to use toupper() function.  int main(void) {     string s = "I want to cast this";  //<-- Or you can ask to the user for a string.      unsigned long int s_len = strlen(s); //<-- getting the length of 's'.        //Defining an array of the same length as 's' to, temporarily, store the case change.     char s_up[s_len];       // Iterate over the source string (i.e. s) and cast the case changing.     for (int a = 0; a < s_len; a++)     {         // Storing the change: Use the temp array while casting to uppercase.           s_up[a] = toupper(s[a]);      }      // Assign the new array to your first variable name if you want to use the same as at the beginning     s = s_up;      printf("%s \n", s_up);  //<-- If you want to see the change made. } //If you want to lowercase a string instead, change toupper(s[a]) to tolower(s[a]).

Example 2: to upper in c

#include <ctype.h> // For function below

Example 3: toupper c programming

int toupper( int arg );