[Solved] can anyone find why is ths program to solve postfix expression giving runtime error

by


You code is hardly readble, still, I think, you need to change

scanf("%c",a[j]);

to

scanf(" %c",&a[j]);  //note the space before %c, and scanf() expects pointer

for

  1. & because as per the scanf() signature, it needs the address to store the scanned result.
  2. leading space [] to stop scanning the previously pressed ENTER [\n] key.

Kindly Check the man page of scanf() for more details.

Also, as mentioned in Mr. @LPs ‘s answer, usage of push(atoi(a)); is very dangerous, in case a is not null-terminated.

solved can anyone find why is ths program to solve postfix expression giving runtime error