rewrite this program (sum,average) using functions, possibly arrays?

[bxstylez]

rewrite this program (sum,average) using functions, possibly arrays?


#include<stdlib.h>
#include<stdio.h>

main()
{
FILE *finpt,
*foutpt;

char ch;
int i,
scr1,scr2,scr3, testSum1=0,testSum2=0,testSum3=0;
float studcount=0.0;

finpt=fopen("tests.txt","r"); foutpt=fopen("copy.txt","w");

fprintf(foutpt,"\nSTUDENT\t\t\tTEST 1\tTEST 2\tTEST 3\t STUDENT AVERAGE\n\n");


while ( fscanf ( finpt," %c",&ch) != EOF) {
fprintf(foutpt,"%c",ch);

for ( i=2; i<=15; i++) {
fscanf(finpt,"%c",&ch);
fprintf(foutpt,"%c",ch);
}

fprintf(foutpt," ");

float avgRow=0;

fscanf(finpt,"%d%d%d",&scr1,&scr2,&scr3);
fprintf(foutpt,"%8d%8d%8d",scr1,scr2,scr3);
fprintf(foutpt,"%16.1f",avgRow=(scr1+scr2+scr3)/3.0);
testSum1+=scr1; testSum2+=scr2; testSum3+=scr3;
studcount++;

fprintf(foutpt,"\n");
}

float avgTest1=testSum1/studcount;
float avgTest2=testSum2/studcount;
float avgTest3=testSum3/studcount;
fprintf(foutpt,"\nTEST AVERAGE%18.1f%8.1f%8.1f",avgTest1,avgTest2,avgTest 3);

fclose(finpt); fclose(foutpt);
return EXIT_SUCCESS;
}

[sicarie]

What's your question? Are you wondering where to start, or do you have a question about passing variables (such as an array) to a function?

[bxstylez]

basically....

how would i go about using functions for summing up the test columns, instead of reading each column one by one and summing up individually

ie: i want to use the following while statement:

while( student(&testSum1,&testSum2,&testSum3,&studCount) !=EOF) ;

..after the last student record is read and processed, i want to use another function for the average,

testAvgs(testSum1,testSum2,testSum3,studCount)

[sicarie]

basically....

how would i go about using functions for summing up the test columns, instead of reading each column one by one and summing up individually

ie: i want to use the following while statement:

while( student(&testSum1,&testSum2,&testSum3,&studCount) !=EOF) ;

..after the last student record is read and processed, i want to use another function for the average,

testAvgs(testSum1,testSum2,testSum3,studCount)

Well, you're looking for two functions, right, sum and average? So it would seem that you would just want to read all the values in (an array would be ideal there), and then pass that to a function, instead of each individual value. That would return an int and take an int[] as a parameter, and internally add all of them into a tempvar. You're looking like you can declare functions above, so I'm going to leave the actual declaration to you, and then average can just take the sum and the size and return the average.

That while statement is a little odd. I take it from the EOF that you're reading them in from a file, but I'd remove the function call from there - it doesn't seem like that will ever be EOF (though it might be null).

You can use getline or a file input stream, depending on how you call it (something like cin >> var, only not using cin). Then declare a counter variable and increment it each time the while loop is executed, use that for the index of your array - scores[i] = varFromFile; i++;

Does that make sense?