Thread: Wheres the glitch?

Can anyone tell me whats wrong with this program. when i try to run it. After entering the first grade, it gives the error message of The instruction at " " referenced memory at " ". The memory could not be written. What exactly does this mean, and what did I do wrong?
Description: Displays the grade average from four tests

#include <stdio.h>
int main()

{
unsigned int grade1=0,grade2=0,grade3=0,grade4=0,total=0; /*declare grade1, grade2, grade3,grade4 as a int variable*/
float average;

total=grade1 + grade2 + grade3 + grade4;
average=total/4.0; /*divide the total by 4.0*/
printf("Enter student1 first grade:\n");
scanf("%f",grade1);
printf("Enter student1 second grade:\n");
scanf("%f",grade2);
printf("Enter student1 third grade:\n");
scanf("%f",grade3);
printf("Enter student1 fourth grade:\n");
scanf("%f",grade4);
printf ("\n The grade average of student1 is %f",average);


return 0;

}

SOS!

1)you initialized grade1,grade2,.... to 0 then took their average , which will be zero.

grade1 is an unsigned integer so no %f use %u ,the second parameter to scanf will be the address of grade1 so scanf("%u",&grade1); , similarly for other grades .

you can have a look at this page whenever you are in doubt about the functions in the c standard library
http://www.acm.uiuc.edu/webmonkeys/book/c_guide/

Originally posted by Unregistered
Can anyone tell me whats wrong with this program. when i try to run it. After entering the first grade, it gives the error message of The instruction at " " referenced memory at " ". The memory could not be written. What exactly does this mean, and what did I do wrong?
Description: Displays the grade average from four tests

#include <stdio.h>
int main()

{
unsigned int grade1=0,grade2=0,grade3=0,grade4=0,total=0; /*declare grade1, grade2, grade3,grade4 as a int variable*/
float average;

total=grade1 + grade2 + grade3 + grade4;
average=total/4.0; /*divide the total by 4.0*/
printf("Enter student1 first grade:\n");
scanf("%f",grade1);
printf("Enter student1 second grade:\n");
scanf("%f",grade2);
printf("Enter student1 third grade:\n");
scanf("%f",grade3);
printf("Enter student1 fourth grade:\n");
scanf("%f",grade4);
printf ("\n The grade average of student1 is %f",average);


return 0;

}

SOS!