toupper y tolower en ejemplo de código c

Después de de esta extensa compilación de datos dimos con la solución este enigma que pueden tener muchos lectores. Te ofrecemos la solución y esperamos que te sea de gran ayuda.

Ejemplo 1: convertir string a mayúsculas en 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//<-- You need this to use printf.#include//<-- You need this to use string and strlen() function.#include//<-- You need this to use toupper() function.intmain(void)
    string s ="I want to cast this";//<-- Or you can ask to the user for a string.unsignedlongint 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]).

Ejemplo 2: programación toupper c

inttoupper(int arg );

Ejemplo 3: convertir string a minúsculas en c

// include all the libraries  used in the program.#include#include#include#include#include// Base Functionintmain(int argc, string argv[])if(argc !=2)printf("Usage: ./substitution keyn");elseif(strlen(argv[1])!=26)printf("Key must contain 26 characters.n");
    
    string key = argv[1].toupper();
    string key = argv[1].tolower();

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