Ios randomly selects the option demo in a certain range of options

Demo function: ios randomly selects a demo in a certain range, such as screenshots. When you click a button, the program will randomly select an option based on the range of button options. Iphone 6.1 passed the test.

Demo Description: MainView. m is the main code in the project demo. Use rand () to generate random numbers. Rand () is used to return an integer of the int type at random, ranging from 0 to RAND_MAX.

Demo screenshot:

 

 

Demo main code:

<STRONG xmlns = "http://www.w3.org/1999/xhtml"> // button RESPONSE event-(IBAction) abcd {// radn () generates a random number, modulo 4. Therefore, the result of rNumber can only be 0, 1, 2, or 3. enter int rNumber = rand () % 4; switch (rNumber) {case 0: result. text = @ "A"; break; case 1: result. text = @ "B"; break; case 2: result. text = @ "C"; break; case 3: result. text = @ "D"; break; default: break; }}- (IBAction) agreeDisagree {int rNumber = rand () % 2; switch (rNumber) {case 0: result. text = @ "Agree"; break; case 1: result. text = @ "Disagree"; break; de Fault: break ;}}</STRONG> // The RESPONSE event of the button-(IBAction) abcd {// radn () generates a random number, and the modulo of 4 is used. Therefore, the result of rNumber can only be 0, 1, 2, or 3. enter int rNumber = rand () % 4; switch (rNumber) {case 0: result. text = @ "A"; break; case 1: result. text = @ "B"; break; case 2: result. text = @ "C"; break; case 3: result. text = @ "D"; break; default: break; }}- (IBAction) agreeDisagree {int rNumber = rand () % 2; switch (rNumber) {case 0: result. text = @ "Agree"; break; case 1: result. text = @ "Disagree"; break; default: break ;}}