Determines whether a number is a prime number.

// Determine a number, whether it is a prime number int A = 0; printf ("enter a number:"); // output bool istrue = yes; // The flag bit to indicate the status. scanf ("% d", & A); // enter for (INT I = 2; I <A; I ++) {if (a % I = 0) {istrue = No ;}}if (istrue = Yes) {printf ("this is a prime number");} else {printf ("This is not a prime number ");}

// Method 2: int A = 0; printf ("enter a number:"); scanf ("% d", & ); // use the for loop to determine for (INT I = 2; I <A; I ++) {if (a % I = 0) {printf ("this number is not a prime number"); break ;}} printf ("loop ends ");

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