In this exercise, you modify the Social Security Number program from the chapter. If necessary, create a new project named Intermediate24 Project and save it in the Cpp8\Chap13 folder. Enter the instructions from Figure 13-22 into a source file named Intermediate24.cpp. Change the filename in the first comment. Before inserting the missing hyphens, verify that the nine characters entered by the user are numeric. Save and then run and test the program.

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1 //SSN.cpp - displays the Social Security number with hyphens 2 //Created/revised by on 3 4 #include 5 #include 6 using namespace std; 7 8 int main) 9 { string ssn = ""; cout « "Nine-character Social Security number: "; getline(cin, ssn); 10 11 12 13 if (ssn. lengthO 9) { //insert hyphens ssn.insert(3, "-"); //xxx-xxxxxx ssn.insert(6, "-"); //xxx-xx-XXXX cout <« "Social Security number: } else cout « "The number must contain 9 characters" « endl; //end if return 0; 14 15 16 17 18 19 « ssn << endl; 20 21 22 23 24 25 } //end of main function a Social Security Number Nine-character Social Security number: 111220000 Social Security number: 111-22-e00a Press any key to continue Figure 13-22 Social Security Number program