Why I am getting wrong output 2686924 instead of 281?

Question

I am new to C++ and learning about it.

Here is a code I have written for Problem No 4 but it's not giving the output.

I am having two problems:

1. #include<iostream>
   #include<stdio.h>
   
   int main(){
   int a,b,c,d,e,f;
   int a2,b2,c2,d2,e2,f2;
   
   int answer;
   
   a=1;
   b=2;
   c=3;
   d=4;
   e=5;
   f=6;
   
   a2=11;
   b2=22;
   c2=33;
   d2=44;
   e2=55;
   f2=66;
   
   7+8+14;
   a+a2;
   b+b2;
   c+c2;
   d+d2;
   e+e2;
   f+f2;
   
   answer=answer;
   cout<<"Answer is"<<answer;
   }
   

It showed me error 'cout' is not declared in the scope but i am using c++ only.

2. But when i changed this code:

   #include<iostream>
   #include<stdio.h>
   
   int main(){
   int a,b,c,d,e,f;
   int a2,b2,c2,d2,e2,f2;
   
   int answer;
   
   a=1;
   b=2;
   c=3;
   d=4;
   e=5;
   f=6;
   
   a2=11;
   b2=22;
   c2=33;
   d2=44;
   e2=55;
   f2=66;
   
   7+8+14;
   a+a2;
   b+b2;
   c+c2;
   d+d2;
   e+e2;
   f+f2;
   
   answer=answer;
   printf("Answer is:");
   printf("%d",answer);
   }
   

This give output 2686924. The output is wrong it should print 281. I have checked every line but no error shows please tell why output is not showing.

Answer 1

您的代码中有许多语句实际上没有任何内容，

7+8+14;
a+a2;
b+b2;
c+c2;
d+d2;
e+e2;
f+f2;

和

answer=answer;

你知道，答案是未初始化的。你永远不会在代码中设置它的值，所以你需要像

这样的东西

// Initialize `answer' here
answer = 7 + 8 + 14;
answer = answer + a + a2;
answer = answer + b + b2;
answer = answer + c + c2;
answer = answer + d + d2;
answer = answer + e + e2;
answer = answer + f + f2;

另外，doyouunderstandthislineoftext？你不能没有空间吧！那么代码也是如此。