What is the output of this code?
#include <stdio.h>
int num = 100;
void modify(void) {
int num = 50;
}
int main(void) {
modify();
printf("%d", num);
return 0;
}Inside modify(), local 'num' shadows global 'num'. Modifying local 'num' leaves global 'num' unchanged at 100.
What is the linkage of a local variable declared inside a C function block?
Local block-scoped variables have no linkage; each declaration refers to a unique entity in that block.
Which of the following functions correctly swaps two integer values in C?
Passing pointers (addresses) and dereferencing them modifies the caller's variables, achieving pass-by-reference effect.
What does 'void func(void)' explicitly specify in a C prototype?
In C, 'void' in the parameter list explicitly states that the function accepts no arguments.
What memory segment stores uninitialized global and uninitialized static variables?
Uninitialized static and global variables are stored in the BSS (Block Started by Symbol) segment and zeroed before execution.