How to debug subsequent request in Phpstorm?

C programming- Can someone help me understand my own solution?

• //Start sample code int x=0,Input=0; char *Data="123456789"; char *Debug=malloc(Getstrlen(Debug)*1000); //Debugger variable fprintf(stdout,"Enter an integer value:"); //Request input fscanf(stdin,"%d",&Input); //code checks for invalid input. for(x;x<=Getstrlen(Data);) //int Getstrlen(char *String) return the length of Data. { if(Input==Data[x]) { gets(Debug);//catch input overflow. free(Debug); system("cls"); //clears screen(not relevent to the question) //Go back to request input. } x++; } //End sample code Ok,if you've ever written C code, at some point you'd have liked or wanted to validate a user's input instead of asking a user to not enter something invalid(because its embarrasing and sucks).You'll know theres no input validation built into the C language and if you enter an alphabeth/character instead of an integer your program will crap out.Theres just no way to check if a user actually entered a character.Using functions from ctype.h in an if statement is no use.So,out of curiousity and love for the lang,I decided to brainstorm some solutions for this.Suffice to say,the above code actually works(Test it and use it in your apps if you want)YaY :D.Problem is:I dont know/remember why.Now,I know its pretty stupid and laughable to ask other coders why your own code/solution works but I need help understanding me own code:P. Please dont flame me for not commenting enough.LOL. Thanks in advance.

• Answer:

  include <iostream> #include <cstdlib> #define BUFFERSIZE 128 // Integrated Development Environment // Visual C++ using namespace std; // your Getstrlen function size_t str_length(char* _str) { size_t _cnt; for (_cnt = 0; _str[_cnt] != 0; _cnt ++); return _cnt; } // C programming: // Can someone help me understand my own solution? void main(void) { int Input = 0; char *Data = "0123456789"; size_t len = str_length(Data); // malloc: allocate a memory. //char *Debug = (char*)malloc(BUFFERSIZE); // calloc: allocate and initialize memory. //char *Debug = (char*)calloc( BUFFERSIZE, sizeof(char)); // new: C++ allocate memory. char *Debug = new char[BUFFERSIZE]; FILE* fin = stdin; while ( true ) { // input printf("Enter an integer value (quit = \'q\'): "); fscanf( fin, "%c", (char*)&Input); // another way is string type. //char Input[2] = ""; //fscanf( fin, "%s", Input); strcpy( Debug, "It\'s not a numeric character."); for(size_t i = 0; i < len; i ++) { if( Input == Data[i] ) { // for stdin: // fflush(stdin) = rewind(stdin) // fin->_base is char type. strcpy( Debug, fin->_base); Debug[str_length(fin->_base) - 2] = 0; } } if ( Input == 'q' ) { break; } cout<<" Debug = "<<Debug<<endl; fflush(fin); system("PAUSE"); // clear screen system("CLS"); } fin = NULL; // flush stdin fflush(stdin); // free: release memory. //free(Debug); // delete: C++ release memory. delete [] Debug; system("PAUSE"); }