View Compilation Error

0_0_4659028_1030.cpp: In function `int main()':
0_0_4659028_1030.cpp:18: error: `sort' undeclared (first use this function)
0_0_4659028_1030.cpp:18: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_4659028_1030.cpp:18: error: `output' undeclared (first use this function)
0_0_4659028_1030.cpp: In function `int sort(int*, int)':
0_0_4659028_1030.cpp:23: error: `int sort(int*, int)' used prior to declaration
0_0_4659028_1030.cpp:37: error: invalid conversion from `int*' to `int'
0_0_4659028_1030.cpp: In function `int output(int*, int)':
0_0_4659028_1030.cpp:39: error: `int output(int*, int)' used prior to declaration