Thread: Function execution question

Originally Posted by raczzoli

Yes, i thought about this solution i just wanted to know if exists any other solution to automate this part, because the other way if i invent a new function every time i have to come back, and add it manually. Not that this would be a big problem...

You can map strings to function pointers such that you can search for the string, obtain the function pointer, then call the function. This way, you just need to modify the contents of the data structure instead of adding another branch to an if-else chain.

Originally Posted by laserlight

You can map strings to function pointers such that you can search for the string, obtain the function pointer, then call the function. This way, you just need to modify the contents of the data structure instead of adding another branch to an if-else chain.

A very basic example of this would be:

Code:

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

void  myHello(void);
void  myGoodBye(void);

int main(void){

	//create framework for function table
	struct myFunctionTable{
		char *myName;
		void (*myFunction)(void);
	};

	//make function table, aka array
	myFunctionTable FunctionTable[]={{"Hello", &myHello}, {"GoodBye", &myGoodBye}};

	char myAnswer[10];


	printf("Which function to run?");
	scanf("%s", myAnswer);

	//find and run function
	for(int i = 0; i < (sizeof(FunctionTable) / sizeof(myFunctionTable));i++){
		if(strcmp(FunctionTable[i].myName,myAnswer)==0){
			FunctionTable[i].myFunction ();
			break;
		}
	}
	getchar();
	getchar();
	return (0);
}
//Implement functions
void myHello(void){
	printf("Hello World\n");
}
void myGoodBye(void){
	printf("GoodBye World\n");
}