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cconditional-operatorgoto

goto not working with ?: operator in C

For learning purposes, I wrote the following code snippet:

for(int i=0;i<10;i++)
{
  for(int j = 0;j<5;j++)        
  {
    //(i==j && i==3)? (goto found) : printf("stya here\n");        
    if(i==j && i==3){goto found;} else {printf("stay here\n");}
  }
}

found:
  printf("yes I am here");

But I wondered when I discovered the omitted statement inside the inner loop not gives error and now I am confused about if-else is not always replaceable with ?: operator. What is the fact here? Why does the commented statement give an error?

Solution

  • The ?: operator is not replacement for if. It works only for expressions: condition ? expr1 : expr2 where both sub-expressions expr1 and expr2 are of the same type (and the whole expression then is of the same type).

    goto is not expression, it is a statement.