View Compilation Error

0_0_7267809_9257.cpp:1:20: iosstream: No such file or directory
0_0_7267809_9257.cpp: In function `int main()':
0_0_7267809_9257.cpp:5: error: `cin' undeclared (first use this function)
0_0_7267809_9257.cpp:5: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_7267809_9257.cpp:5: error: `a' undeclared (first use this function)
0_0_7267809_9257.cpp:5: error: `b' undeclared (first use this function)
0_0_7267809_9257.cpp:6: error: `cout' undeclared (first use this function)
0_0_7267809_9257.cpp:6: error: `endl' undeclared (first use this function)