View Compilation Error

0_0_26847280_31759.cpp: In function 'int main()':
0_0_26847280_31759.cpp:8:25: error: 'a' was not declared in this scope
             printf("%d",a+b);
                         ^
0_0_26847280_31759.cpp:8:27: error: 'b' was not declared in this scope
             printf("%d",a+b);
                           ^