SEGMENTATION FAULT (CORE DUMPED) IN C

Common reason why you would get such an error message despite of no syntax error being spotted after compilation are:

1)you are not passing the memory address of the variable to a scanf statement. for example:

int n;

scanf("%d",n); // wrong statement

scanf("%d",&n);//correct statement

In case of a string ,it is not necessary to place '&' :

char ans[10];

scanf("%s",ans);//correct statement

2)your user defined function is falling into an infinite loop;

void recur(int x)

{

recur(x);

} 

3)if you are playing with strings in your code the it is preferable that you use fflush(stdin) after every input statement;

scanf("%s",ans);

fflush(stdin);