hi guyz
i have a homework with a lot of thinks to do but i have a proplem in one of this thinkz, sorting by a member(field) of a struct.
(my english is not good..)
we will call function void sorting that will sorting the table in declining line (top bigger-bottom smaller) as for the grade. If two or more students have the same grade, first will be written the student with the smaller ID
i try to do sorting with many wayz
i try to put this value 'table[pass].grade' in a variable
i try to compare this without variable.
table[pass].grade < table[row].grade
but nothing
compiler says to me:
many times this
In function `void sorting(student)':
75 D:\my files\TEI\D cemester\texnikes prog\texn_teu_3\katranitsas_ask3v2.0.cpp no match for 'operator[]' in 'table[pass]'
76 D:\my files\TEI\D cemester\texnikes prog\texn_teu_3\katranitsas_ask3v2.0.cpp no match for 'operator[]' in 'table[row]'
many times this
and this
In int main()':
272 D:\my files\TEI\D cemester\texnikes prog\texn_teu_3\katranitsas_ask3v2.0.cpp conversion from `student*' to non-scalar type `student' requested
this one was written to me at poin tha i call sorting function in main.
CODE
#include<iostream.h>
#include<fstream.h>
#include<string>
struct student{
char lname[20]; <--its mean lname
int ID; <--its mean ID
char year; <--year
int grade; <--grade
};
void getData(ifstream& file, student* table){
for(int i(0); i<100; i++)
file>>table[i].lname>>table[i].id
>>table[i].year>>table[i].grade;
}//end void getData
//that is working, i dont call this function wet
void menu(int& eggrafi, int& epilogi){
do{
cout<<"Dose to aritmo tis eggrafis pou theleis epeksergasteis\n"
<<"i timi prepei na einai metaksi tou 0 kai tou 99\n"
<<"eggrafi : ";
cin>>eggrafi;
cout<<"Dose to aritmo tis epilogis\n"
<<"i timi prepei na einai metaksi tou 1 kai tou 5\n"
<<"dose 1 gia na ginei swap tis eggrafis 'eggrafi'"
<<"tou protou pinaka me tin eggrafi 'eggrafi' tou deuterou \n"
<<"dose 2 gia na ginei swap to onoma tis eggrafis 'eggrafi'"
<<"tou protou pinaka me to omoma tis eggrafi 'eggrafi' tou "
<<"deuterou \n"
<<"dose 3 gia na ginei swap tou AEM tis eggrafis 'eggrafi'"
<<"tou protou pinaka me ton AEM tis eggrafi 'eggrafi' tou "
<<"deuterou \n"
<<"dose 4 gia na ginei swap tou etous tis eggrafis 'eggrafi'"
<<"tou protou pinaka me to etos tis eggrafi 'eggrafi' tou "
<<"deuterou \n"
<<"dose 5 gia na ginei swap ton vathmo tis eggrafis 'eggrafi'"
<<"tou protou pinaka me ton vathmo tis eggrafi 'eggrafi' tou "
<<"deuterou \n\n"<<"epilogi : ";
cin>>epilogi;
}while((eggrafi<0 || eggrafi>99) && (epilogi <1 || epilogi>5));
}//end void menu
[color=#FF0000]//here is the problem(maybe..)[/color]
void sorting(student table)
{
student temp_storage;
int gradePass, gradeRow;
for(int pass(0); pass < 2; pass++)
for(int row(1); row < 2; row++)
{
gradePass=table[pass].grade;
gradeRow=table[row].grade;
if(gradePass < gradeRow)
{
temp_storage = table[pass];
table[pass] = table[row];
table[row] = temp_storage;
}
if(table[pass].grade == table[row].grade)
{
if(table[pass].id > table[row].id)
{
temp_storage = table[pass];
table[pass] = table[row];
table[row] = temp_storage;
}
}
}//end for(row
}//end sorting void
//merge function was wrong but if you help me in sorting
//function i solve this alone
void merge(student** table1, student** table2, student** table3){
int pA,pB,pC;
pA=pB=pC=0;
while(pA<100 && pB<100)
{
if(table1[pA]->vathmos <table2[pB]->vathmos)
{
table3[pC] = table2[pB];
pC++;
}
else if(table1[pA]->vathmos >table2[pB]->vathmos)
{
table3[pC] = table1[pA];
pC++;
}
else if(table1[pA]->vathmos == table2[pB]->vathmos)
{
if(table1[pA]->aem > table2[pB]->aem)
{
table3[pC] = table2[pB];
pC++;
}
else
{
table3[pC] = table2[pB];
pC++;
}
}
if(pA==100)
{
for(int i(pB); i<2;i++)
{
table3[pC]=table2[pB];
pC++;
}
}
else
for(int i(pA); i<2; i++)
{
table3[pC]=table1[pA];
pC++;
}
}//end while
}//end void merge
main(){
student table1[100];
student table2[100];
student table3[200];
ifstream file1;
file1.open("students1.dta");
getData(file1, table1);
file1.close();
ifstream file2;
file2.open("students2.dta");
getData(file2, table2);
file2.close();
sorting( table1);
sorting( table2);
system("pause");
}//end main
any syntax error are owed to copy-paste and at translating
sssssooooorrrrryyyyy about my english
Please help me out with it
I would really appreciate that !!
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