C Programming Tutorial - strcat and strcpy

1. how to convert a lower case letter to an upper case letter

#include<stdio.h>

int main() {

    char a = 'a';

    char b = 'F';

    char c = '7';

    

    printf ("%c \n", toupper(a) ) ; (function for this is toupper)

    printf ("%c \n", toupper(b) ) ; 

    printf ("%c \n", toupper(c) ) ; 

    

  return 0;

}

2.

#include<stdio.h>

#include<string.h>  (Contains bunch of cool built in string functions)

int main() {

char muffin[100](wee need to make sure bunch of space in it) = "Hey " ; 

strcat(muffin, "Thileban" );  (string can catinate, tag on end of the one string to the other) 

printf("%s \n", muffin);

    

  return 0;

}

3.

#include<stdio.h>

#include<string.h>

int main() {

char muffin[100] = "Hey " ; (we need to make sure it never pass 100)

strcat(muffin, "Thileban " ); 

strcat(muffin, "you " ); 

strcat(muffin, "smell! " ); 

printf("%s \n", muffin);

    

  return 0;

}

4.

#include<stdio.h>

#include<string.h>

int main() {

char muffin[100] = "Hey " ; 

strcat(muffin, "Thileban " ); 

strcat(muffin, "you " ); 

strcat(muffin, "smell! " ); 

printf("%s \n", muffin);

strcpy(muffin, "Thileban is Awesome!"); (String copy, replace one string with another, this over writes with the other) 

printf("%s \n", muffin);

  return 0;

}