View Compilation Error

0_0_16815585_608.c:1:1: error: expected identifier or '(' before '/' token
 //#include<iostream>
 ^
0_0_16815585_608.c:1:3: error: stray '#' in program
 //#include<iostream>
   ^
0_0_16815585_608.c:6:1: error: expected identifier or '(' before '/' token
 //int fab(int A,int B,int n){
 ^
0_0_16815585_608.c:16:1: error: expected identifier or '(' before '/' token
 //int test(int A,int B){
 ^
0_0_16815585_608.c: In function 'main':
0_0_16815585_608.c:38:8: error: 'true' undeclared (first use in this function)
  while(true){ 
        ^
0_0_16815585_608.c:38:8: note: each undeclared identifier is reported only once for each function it appears in
0_0_16815585_608.c:48:3: error: expected expression before '/' token
   // int round=test(A,B);
   ^
0_0_16815585_608.c:50:4: error: expected expression before '/' token
    //for(int i=1;i<=20;i++)
    ^