IOS getting started tutorial (III)-c language features, ios getting started tutorial-c features

IOS getting started tutorial (III)-c language features, ios getting started tutorial-c features

// 3. C language features // 3.1 Function Definition // function return type function name (parameter) {// dosomthing //} This is the general function definition, // there is an old function definition method. The parameter void printMesg (msg, loopNum) int loopNum; int msg; {int I; for (I = 0; I <loopNum; I ++) {printf ("% d cycle % d \ n", I + 1, msg );}} // 3.2 Function declaration // The Declaration of the function is used for the use of the function before the definition of int add (int a, int B); // int main () {// int maxInt = add (3.3); //} int add (int a, int B) {return a + B ;}// parameter transfer, object-C uses the void swap (int a, int B ){ Int temp = a; a = B; B = temp; printf ("the value of a is % d, and the value of B is % d", a, B );} // For pointer-type variables, it also uses value transfer/* Draw is a class with two attributes: int a, int B; void swap (Draw * dw) {int temp = dw. a; dw. a = dw. b; dw. B = temp;} int main () {Draw dw = [Draw alloc] init]; dw. a = 6; dw. B = 9; return 0;} * // dw is a pointer variable. It is also passed as a value and copied as a pointer, // but it is strange that the pointer operation is a Draw object. No matter which pointer, the operated // is a Draw object. So the property change is taken for granted. // 3.4 recursive function // 3.5 internal function and external function/* internal function: static modification is used for definition and can only be called by the function in the current source file, therefore, it is called an internal function external function. It can be called by any source file without any modifiers, generally, all functions are external functions. * // Defines the extern function. If extern is omitted, the extern printRect (int height, int width) {for (int I = 0; I 



Getting started with ios
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How can I lay a good foundation for C language by studying iOS development?
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