How can i make this c++ program display the gpa as a decimal?? please help me! thanks so....... much?

#include %26lt;stdio.h%26gt;


#include %26lt;iostream%26gt;


#include %26lt;string%26gt;


using namespace std;








int main ()





{





string mystr;


double mark, gpa = 0.0;


char grade [2] = "F" ;


cout %26lt;%26lt; "What's your name? ";


getline (cin, mystr);


cout %26lt;%26lt; "nice name " %26lt;%26lt; mystr %26lt;%26lt;"\n";


cout %26lt;%26lt; "What is your grade? ";


cin %26gt;%26gt; mark;


if (mark %26gt;= 90 %26amp;%26amp; mark %26lt;= 100)


{


*grade = 'A';


gpa = 4.0;


}


else if (mark %26gt;= 85)


{


*grade = 'B';


grade[1] = '+';


gpa = 3.5;


}


else if (mark %26gt;= 80)


{


*grade = 'B';


gpa = 3.0;


}


else if (mark %26gt;= 75)


{


*grade = 'C';


grade[1] = '+';


gpa = 2.5;


}


else if (mark %26gt;= 70)


{


*grade = 'C';


gpa = 2.0;


}


else if (mark %26gt;= 60)


{


*grade = 'D';


gpa = 1.0;


}


else


{


*grade = 'F';


gpa = 0.0;


}


cout %26lt;%26lt; mystr %26lt;%26lt; " got a ";


if (*grade == 'A') cout %26lt;%26lt; 'n';


cout %26lt;%26lt; grade %26lt;%26lt; " in your class and a GPA of " %26lt;%26lt; gpa %26lt;%26lt; endl;


system("pause");


return 0;


}

How can i make this c++ program display the gpa as a decimal?? please help me! thanks so....... much?
#include %26lt;stdio.h%26gt;





int main (void)


{


char mystr[80];


double mark, gpa = 0.0;


char grade [2] = "F" ;


printf("What's your name? ");


fgetline (mystr, 80, stdin);


printf("nice name %s\n", mystr);


printf("What is your grade? ");


scanf("%d", %26amp;mark);


if (mark %26gt;= 90 %26amp;%26amp; mark %26lt;= 100)


{


*grade = 'A';


gpa = 4.0;


}


else if (mark %26gt;= 85)


{


*grade = 'B';


grade[1] = '+';


gpa = 3.5;


}


else if (mark %26gt;= 80)


{


*grade = 'B';


gpa = 3.0;


}


else if (mark %26gt;= 75)


{


*grade = 'C';


grade[1] = '+';


gpa = 2.5;


}


else if (mark %26gt;= 70)


{


*grade = 'C';


gpa = 2.0;


}


else if (mark %26gt;= 60)


{


*grade = 'D';


gpa = 1.0;


}


else


{


*grade = 'F';


gpa = 0.0;


}


printf("%s got a ", mystr);


if (*grade == 'A') putchar('n');


printf("%s in your class and a GPA of %.1f\n", grade, gpa);


system("pause");


return 0;


}
Reply:Back in my day, we had to use printf(), and walk ten miles each way... in the SNOW.