Process control statement (example)

1. switch statement: determines the season of the month entered by the user. namespace switch statement {class Program {static void Main (string [] args) {// determines the season Console for the month you entered. writeLine ("enter a month! "); Int MyMouth = int. parse (Console. readLine (); // variable MyMouth is used to obtain user input data string MySeason; switch (MyMouth) {case 12: case 1: case 2: MySeason = "this month is winter! Learn to keep warm! "; Break; // jump out of the switch statement case 3: case 4: case 5: MySeason =" this month is spring! Xue min remembers to wear glasses to avoid strong winds! "; Break; case 6: case 7: case 8: MySeason =" this month is summer! Xue min remembers to eat ice cream and wear hot pants! "; Break; case 9: case 10: case 11: MySeason =" this month is autumn! This is a good harvest season. I often call home greetings! "; Break; default: MySeason =" month input error! TIPS: only 1 ~ October December! "; Break;} Console. writeLine (MySeason); Console. readLine () ;}} running result: 2. while statement: declare two int-type variables: s and num. The initial values are 0 and 100, respectively. loop output through the while statement. When s is greater than 50, use the break statement to terminate the loop. When s is an even number, use continue to start the next loop. Namespace while statement {class Program {static void Main (string [] args) {// when s> 50, use the break statement to terminate the loop. When s is an even number, use continue to start the next loop int s = 0; int num = 100; while (s <num) {s ++; if (s> 50) {break ;} if (s % 2 = 0) {continue;} Console. write (s + "");} Console. writeLine ("\ n min, the above is the output of all odd numbers from 0 to 50! Please check it out! "); Console. readLine () ;}} running result: 4. for statement: declare an int-type array, add five values to the array, and use the for loop statement to traverse the array, and output the values in the array. namespace for statement {class Program {static void Main (string [] args) {string [] xuemin; xuemin = new string [5]; // declare a string array with five elements. xuemin [0] = "Hello! "; // Add the element xuemin [1] =" My name is Han xuemin "; xuemin [2] =" I like computer learning! "; Xuemin [3] =" thank you for your support !!! "; Xuemin [4] =" I will work hard and devote of my enthusiasm! "; For (int I = 0; I <xuemin. length; I ++) // use the for statement to output each element in the array {Console. writeLine ("xuemin [{0}] value: {1}", I, xuemin [I]);} Console. readLine () ;}}5, foreach statement: traverse the array namespace foreach statement {class Program {static void Main (string [] args) {int count; Console. writeLine ("Enter the number of friends of student sensitivity"); count = int. parse (Console. readLine (); string [] names = new string [count]; // declares the array names. The number of elements in the array is the number of friends in the input field. count (Int I = 0; I <names. length; I ++) {Console. writeLine ("enter the name of {0} friend of student sensitivity:", I + 1); names [I] = Console. readLine ();} Console. writeLine ("friends who have output learning sensitivity are as follows:"); foreach (string name in names) // The foreach statement traverses the Array {Console. writeLine ("{0}", name);} Console. readKey () ;}}6, break statement: for the application example of the switch statement and the while statement, see the application of 1 and 2 in the for statement above: namespace break statement {class Program {static void Main (string [] args) {for (int I = 0; I <3; I ++) {Console. write ("\ n {0} cycles:", I); // The output shows the number of cycles for (int j = 0; j <200; j ++) {if (j = 12) // if the value of j is 12 break; // terminate the cyclic Console. write (j + ""); // output j} Console. readLine () ;}}7. for the use of the while statement, see Example 2. the usage of for statements is similar. no more examples. 8. goto statement: the program jumps to the specified statement through the goto statement. Namespace goto statement {class Program {static void Main (string [] args) {Console. writeLine ("Enter the query text:"); string inputstr = Console. readLine (); // assign the input text to the inputstr variable string [] Mystr = new string [5]; // declare a string array, the array name is Mystr [0] = "Thank you! "; // Assign Mystr [1] =" to each array element. I'm not happy today. "; Mystr [2] =" very serious consequences! "; Mystr [3] =" I'm so hungry! "; Mystr [4] =" when to eat? "; For (int I = 0; I <Mystr. length; I ++) {if (Mystr [I]. equals (inputstr) // determines whether the input text exists in the array. If yes, the query jumps to the Found statement {goto Found;} Console. writeLine ("the" {0} "you are looking for does not exist", inputstr); // if it does not exist, output the prompt statement and jump to the Finish statement goto Finish; Found: Console. writeLine ("the" {0} "you are looking for exists! ", Inputstr); Finish: Console. writeLine ("\ n search completed"); Console. readLine () ;}} 9, return Statement namespace return Statement {class Program {static string MyStr (string str) {string OutStr; // declare a string variable OutStr = "\ n Han Zong (Han xuemin) Your input data is" + str; // assign a value to return OutStr for the variable OutStr; // return the string variable OutStr} static void Main (string [] args) {Console. writeLine ("Han Zong, please enter the meeting content:"); // output the prompt message string inputstr = Console. readLine (); // obtain the input data and assign it to the variable inputstr Console. writeLine (MyStr (inputstr); // call the MyStr method and display the result to the Console. readLine ();}}}