View Compilation Error

681977_0_0_31111.c:1:20: iostream: No such file or directory
681977_0_0_31111.c:2: error: syntax error before "namespace"
681977_0_0_31111.c:4: error: syntax error before '&' token
681977_0_0_31111.c: In function `exgcd':
681977_0_0_31111.c:6: error: `b' undeclared (first use in this function)
681977_0_0_31111.c:6: error: (Each undeclared identifier is reported only once
681977_0_0_31111.c:6: error: for each function it appears in.)
681977_0_0_31111.c:8: error: `x' undeclared (first use in this function)
681977_0_0_31111.c:9: error: `y' undeclared (first use in this function)
681977_0_0_31111.c:10: error: `a' undeclared (first use in this function)
681977_0_0_31111.c: In function `main':
681977_0_0_31111.c:23: error: `cin' undeclared (first use in this function)
681977_0_0_31111.c:33: error: `cout' undeclared (first use in this function)
681977_0_0_31111.c:33: error: `endl' undeclared (first use in this function)