c++ - My program is showing many errors, "error: no matching function for call to 'getPercentScore'" -

i have program has read 2 input files , sort data 2 files. have figured of things out keep trying pass stricter array function not working.

int main() {     int labnumber=8;     string labname = "math anyone";     printheader(labname, labnumber);      ifstream    infile;             //input input file stream      struct test {         string firstname;           //input student first name         string lastname;            //input student last name         string tempfirstname;       //input temporary first name used place actual         string templastname;        //input temporary last name used place actual         string tempid;              //input temporary id used compare actual         string studentid;           //input student id         double coursescore;         //output student score %         char coursegrade;           //output student letter grade         string answers;             //input student answer     };     test *table[30]; 

this part of code; have 1 input file called functions.cpp

    (int i=0;i<studentcount;i++)     {         double percent=0;         getpercentscore(table[30], key);     } 

functions.cpp:

double getpercentscore(test *, string key)  {     double tempscore=0;     double percent;     (int i=0;i<20;i++)     {         if (table[i].answers[i] == key[i])         {             tempscore = tempscore + 2; //add 2 if answer correct         }         else if (table[i].answers[i] == '_')         {             tempscore = tempscore + 0;//add 0 if answer if unanswered         }         else         {             tempscore = tempscore - 1;//subtract 1 wrong answer         }     }     percent = tempscore/40;     percent = percent*100;     return percent; } 

my program has been giving me error , not know how solve it:

../lab8.cpp:112:3: error: no matching function call 'getpercentscore' getpercentscore(table[30], key); ^~~~~~~~~~~~~~~ ../lab8.cpp:33:8: note: candidate function not viable: no known conversion 'test *' 'test *' 1st argument double getpercentscore(test *, string key);

any apreciated.

first, try create test array:

test table[30]; 

at functions.cpp declare function getpercentscore() as:

double getpercentscore(test tbl[], string key)  

also, replace reference of table inside getpercentscore() body tbl.

if wish know size of array, pass parameter like:

size_t size = sizeof(table) / sizeof(test); (int i=0;i<studentcount;i++) {     double percent=0;     getpercentscore(table, size, key); } 

hope helped you...