Why does not this compile?
#include <stdio.h>
int main(void) {
int valor = 0;
scanf("%d", &valor);
switch (valor) {
case 0:
int variavel = 1;
printf("%d", variavel);
break;
default:
int variavel = 2;
printf("%d", variavel);
}
}
A common misconception is that people find that case is a block of commands and generates a new scope. In fact% w / o% is just a label . So it's just a name for a code address used to cause a deviation. In fact a case is only a switch based on a value.
This already works:
#include <stdio.h>
int main(void) {
int valor = 0;
scanf("%d", &valor);
switch (valor) {
case 0: {
int variavel = 1;
printf("%d", variavel);
break;
} default: {
int variavel = 2;
printf("%d", variavel);
}
}
}
See running on ideone .
The keys create a block and a scope, there you can create the variables.