View Compilation Error

0_0_4495254_31018.cpp: In function `int main()':
0_0_4495254_31018.cpp:20: error: `i' undeclared (first use this function)
0_0_4495254_31018.cpp:20: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_4495254_31018.cpp:25: error: `j' undeclared (first use this function)
0_0_4495254_31018.cpp:27: error: `l' undeclared (first use this function)
0_0_4495254_31018.cpp:27: error: `r' undeclared (first use this function)
0_0_4495254_31018.cpp:37: error: `mm' undeclared (first use this function)
0_0_4495254_31018.cpp:38: error: `x' undeclared (first use this function)