Please help me check the loop

Question

After the first loop it will appear

**************************************************
printf("Transaction Code (S=sold, P=purchased, X=exit) :
Invalid transaction code!
*it direct show invalid cannot key in the value

printf("Transaction Code (S=sold, P=purchased, X=exit) :
**********************'***************************
https://code.sololearn.com/cDhlLXbl68F9/?ref=app

Answer 1

Line 18:
Missing return type for main function

Line 44:
Add a space before the %c specifier to consume whitespace left in the input buffer

scanf(" %c", &txn.code);

Answer 2

No problem 👌
Oh one more thing, also #include <string.h> to use strcpy() 👍

Answer 3

Thanks you

Answer 4

Thanks for reminding me😂