C Language Learning 002: the first complete C program code, language learning 002

C Language Learning 002: the first complete C program code, language learning 002

# Include <stdio. h> // reference the related external library, stdio. h contains the code for reading and writing data from the terminal. The program uses the return value of the main function to determine whether the program runs successfully. 0 indicates that the program is successful, non-0 indicates that the main return value in the ansi c standard may be void, but the value in C99 must be intint main () {int decks; puts ("number of cards entered"); // print the data in the terminal scanf ("% I", & decks); // % I receives an integer if (decks <1) {puts ("invalid sub-number"); return 1;} printf ("A total of % I cards \ n", (decks * 52 )); // print data in the terminal return 0 ;}