View Compilation Error

77741_0_4051.c:1:20: iostream: No such file or directory
77741_0_4051.c:2:18: string: No such file or directory
77741_0_4051.c:3: error: syntax error before "namespace"
77741_0_4051.c: In function `main':
77741_0_4051.c:7: error: `string' undeclared (first use in this function)
77741_0_4051.c:7: error: (Each undeclared identifier is reported only once
77741_0_4051.c:7: error: for each function it appears in.)
77741_0_4051.c:7: error: syntax error before "str"
77741_0_4051.c:8: error: `cin' undeclared (first use in this function)
77741_0_4051.c:10: error: `str' undeclared (first use in this function)
77741_0_4051.c:22: error: incompatible types in assignment
77741_0_4051.c:32: error: `s2' undeclared (first use in this function)
77741_0_4051.c:39: error: `cout' undeclared (first use in this function)
77741_0_4051.c:39: error: `endl' undeclared (first use in this function)