View Compilation Error

0_0_11260970_26641.cpp: In function `int main()':
0_0_11260970_26641.cpp:6: error: `intsum' undeclared (first use this function)
0_0_11260970_26641.cpp:6: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_11260970_26641.cpp:6: error: `i' undeclared (first use this function)
0_0_11260970_26641.cpp:7: error: `charinput' undeclared (first use this function)
0_0_11260970_26641.cpp:10: error: `input' undeclared (first use this function)
0_0_11260970_26641.cpp:12: error: `sum' undeclared (first use this function)
0_0_11260970_26641.cpp:17: error: `return0' undeclared (first use this function)