I'd like a function to process what a user enters, filter it, and return the resulting string to whichever function called it.
Can this work without declaring an global variable like the one below?
#include <stdio.h>
char entry[12]; // globals aren't appealing!
char *read_entry() {
scanf("%s",entry);
return entry;
}
int main(void) {
printf("%s",read_entry());
}Declare a character pointer inside main(), then supply that pointer as a parameter of read_entry().
#include <stdio.h>
char *read_entry(char *entry) {
scanf("%s",entry);
return entry;
}
int main(void) {
char entry[12]; // Storage must be reserved
printf("%s",read_entry(entry));
}Can this work without declaring an global variable like the one below?
Yes, certainly, as demonstrated by the other response.
Still, don't dismiss every global variable as unappealing, because they do have uses.
Remember also that C supports module scope, where something can be accessed inside its module but isn't exposed outside it. Those variables deserve consideration too.
This, therefore, is entirely reasonable:
#include <stdio.h>
static char entry[12]; // Module scope is fine
static char *read_entry() {
scanf("%s",entry);
return entry;
}
int main(void) {
printf("%s",read_entry());
}Nim 2 decides copy or move per call site. Not per proc. Same argument, same proc. The first call copies, because a is still n…
What would be a way for me to write a panic-safe mecanism in Rust that behaves similarly to Java's try { ... } finally { ...…
Whenever I attempt keyboard input into some char arrays, my program ends up crashing. What's a straightforward way of reading…
