src.c:1:6: error: expected expression before 'int'
num1=int(input(''))
^
src.c:1:16: error: empty character constant
num1=int(input(''))
^
src.c:2:16: error: empty character constant
num2=int(input(''))
^
src.c:3:16: error: empty character constant
num3=int(input(''))
^