View Compilation Error

0_0_12177870_27062.cpp: In function `void qsort(int*, int, int)':
0_0_12177870_27062.cpp:7: error: `rand' undeclared (first use this function)
0_0_12177870_27062.cpp:7: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_12177870_27062.cpp:16: error: `i' is not a type
0_0_12177870_27062.cpp:16: error: request for member of non-aggregate type before '+' token