View Compilation Error

0_0_7265017_29145.cpp: In function `void add(int*, int*, int*)':
0_0_7265017_29145.cpp:13: error: `i' undeclared (first use this function)
0_0_7265017_29145.cpp:13: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_7265017_29145.cpp: In function `void tran(char*, int*)':
0_0_7265017_29145.cpp:25: error: declaration of 'int x[0u]' shadows a parameter
0_0_7265017_29145.cpp:25: error: `strlen' undeclared (first use this function)
0_0_7265017_29145.cpp: In function `void invtran(int*, char*)':
0_0_7265017_29145.cpp:31: error: `i' undeclared (first use this function)
0_0_7265017_29145.cpp: In function `void calc(char*, char*)':
0_0_7265017_29145.cpp:41: error: `cc' undeclared (first use this function)