View Compilation Error

1027168_0_0_1399.cpp: In function `int main()':
1027168_0_0_1399.cpp:29: error: `de' undeclared (first use this function)
1027168_0_0_1399.cpp:29: error: (Each undeclared identifier is reported only once for each function it appears in.)
1027168_0_0_1399.cpp:30: error: `find_max' undeclared (first use this function)
1027168_0_0_1399.cpp: At global scope:
1027168_0_0_1399.cpp:36: error: ISO C++ forbids declaration of `de' with no type
1027168_0_0_1399.cpp: In function `int de(char*, int)':
1027168_0_0_1399.cpp:36: error: `int de(char*, int)' used prior to declaration
1027168_0_0_1399.cpp:39: error: `check' undeclared (first use this function)
1027168_0_0_1399.cpp: In function `int check(char*)':
1027168_0_0_1399.cpp:43: error: `int check(char*)' used prior to declaration
1027168_0_0_1399.cpp: In function `int find_max()':
1027168_0_0_1399.cpp:54: error: `int find_max()' used prior to declaration