View Compilation Error

0_0_9016924_4610.cpp: In function `int main()':
0_0_9016924_4610.cpp:26: error: `whilescanf' undeclared (first use this function)
0_0_9016924_4610.cpp:26: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_9016924_4610.cpp:26: error: expected `;' before ')' token