Why is no datatype before num1 = num2

Question

#include <stdio.h>

int main() {
int num1 = 15, num2 = 100;

// assign the value of num2 to num1
num1 = num2;
printf("num1 is %d", num1);

return 0;
}

Answer 1

Because you have already declared these variables so don't need to declare again an again

Answer 2

Thanks