java - Labeled loop,continue keyord does not work - 


import java.util.scanner;  class details {     int num;     string names[][];     double marks[][];     double total[];     string grades[];      void getdata() {         scanner ob = new scanner(system. in );         system.out.print("enter number of students : ");         num = ob.nextint();         names = new string[num][2];         marks = new double[num][4];         (int x = 0; x             system.out.print("first name : ");             names[x][0] = ob.next();             system.out.print("last name : ");             names[x][1] = ob.next();             loop1:              (int p = 1; p <= 1; p++)             {                 system.out.print("\tfirst test marks : ");                 marks[x][0] = ob.nextdouble();                 if ((marks[x][0] < 0) || (marks[x][0] > 15))                 {                     system.out.println("marks should within 0 15");                     continue loop1;                 }             }             loop2:              (int p = 1; p <= 1; p++)             {                 system.out.print("\tmid term marks : ");                 marks[x][1] = ob.nextdouble();                 if (marks[x][1] < 0 || marks[x][1] > 20)                 {                     system.out.println("marks should within 0 20");                     continue loop2;                 }             }             loop3:              (int p = 1; p <= 1; p++)             {                 system.out.print("\tlab test marks : ");                 marks[x][2] = ob.nextdouble();                 if (marks[x][2] < 0 || marks[x][2] > 15)                 {                     system.out.println("marks should within 0 15");                     continue loop3;                 }             }             loop4:              (int p = 1; p <= 1; p++)             {                 system.out.print("\tfinal marks : ");                 marks[x][3] = ob.nextdouble();                 if (marks[x][3] < 0 || marks[x][3] > 50)                 {                     system.out.println("marks should within 0 20");                     continue loop4;                 }             }             system.out.println();         }     }     public void total() {         total = new double[num];         (int x = 0; x             total[x] = marks[x][0] + marks[x][1] + marks[x][2] + marks[x][3];         }     }     public void grades() {         grades = new string[num];         (int x = 0; x             if (total[x] >= 80) {                 grades[x] = "a";             } else if (total[x] >= 70) {                 grades[x] = "b";             } else if (total[x] >= 60) {                 grades[x] = "c";             } else if (total[x] >= 50) {                 grades[x] = "d";             } else {                 grades[x] = "f";             }         }     }     void print() {         system.out.println("\t\t\tresult sheet\n\n\tfirst name\tlast name\tgrade");         (int x = 0; x             system.out.println("\t" + names[x][0] + "\t\t" + names[x][1] + "\t\t" + grades[x]);         }     } } class test {     public static void main(string[] args) {         details data = new details();         data.getdata();         data.total();         data.grades();         data.print();     } }

the problem continue keyword, doesn't work weather give wrong input

i don't think you've understood meaning of continue keyword. continues you've used won't @ current position. take instance segment:

loop1:  (int p = 1; p <= 1; p++) {     system.out.print("\tfirst test marks : ");     marks[x][0] = ob.nextdouble();     if ((marks[x][0] < 0) || (marks[x][0] > 15))     {         system.out.println("marks should within 0 15");         continue loop1;     } }

when if-condition succeeds, prints , continues next iteration of loop1. would've continued next iteration anyways, since continue keyword @ end of looped segment. however, since for-loops run once, there is no next iteration , loop stopped.

perhaps better solution use while-loop this:

while(true) {     system.out.print("\tfirst test marks : ");     marks[x][0] = ob.nextdouble();     if ((marks[x][0] < 0) || (marks[x][0] > 15)) {         system.out.println("marks should within 0 15");     } else {         break;     } }

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