'must' return 'int'

[mumug00]

#include <stdio.h>
#include <math.h>

#define CMAX 10 //max. number of variables in economic function
#define VMAX 10 //max. number of constraints


int NC, NV, NOPTIMAL,P1,P2,XERR;
double TS[CMAX][VMAX];

void Data() {
double R1,R2;
char R;
int I,J;
printf("\n LINEAR PROGRAMMING\n\n");
printf(" MAXIMIZE (Y/N) ? "); scanf("%c", &R);
printf("\n NUMBER OF VARIABLES OF ECONOMIC FUNCTION ? "); scanf("%d", &NV);
printf("\n NUMBER OF CONSTRAINTS ? "); scanf("%d", &NC);
if (R == 'Y' || R=='y')
R1 = 1.0;
else
R1 = -1.0;
printf("\n INPUT COEFFICIENTS OF ECONOMIC FUNCTION:\n");
for (J = 1; J<=NV; J++) {
printf(" #%d ? ", J); scanf("%lf", &R2);
TS[1][J+1] = R2 * R1;
}
printf(" Right hand side ? "); scanf("%lf", &R2);
TS[1][1] = R2 * R1;
for (I = 1; I<=NC; I++) {
printf("\n CONSTRAINT #%d:\n", I);
for (J = 1; J<=NV; J++) {
printf(" #%d ? ", J); scanf("%lf", &R2);
TS[I + 1][J + 1] = -R2;
}
printf(" Right hand side ? "); scanf("%lf", &TS[I+1][1]);
}
printf("\n\n RESULTS:\n\n");
for(J=1; J<=NV; J++) TS[0][J+1] = J;
for(I=NV+1; I<=NV+NC; I++) TS[I-NV+1][0] = I;
}

void Pivot();
void Formula();
void Optimize();

void Simplex() {
e10: Pivot();
Formula();
Optimize();
if (NOPTIMAL == 1) goto e10;
}

void Pivot() {

double RAP,V,XMAX;
int I,J;

XMAX = 0.0;
for(J=2; J<=NV+1; J++) {
if (TS[1][J] > 0.0 && TS[1][J] > XMAX) {
XMAX = TS[1][J];
P2 = J;
}
}
RAP = 999999.0;
for (I=2; I<=NC+1; I++) {
if (TS[I][P2] >= 0.0) goto e10;
V = fabs(TS[I][1] / TS[I][P2]);
if (V < RAP) {
RAP = V;
P1 = I;
}
e10:;}
V = TS[0][P2]; TS[0][P2] = TS[P1][0]; TS[P1][0] = V;
}

void Formula() {;
//Labels: e60,e70,e100,e110;
int I,J;

for (I=1; I<=NC+1; I++) {
if (I == P1) goto e70;
for (J=1; J<=NV+1; J++) {
if (J == P2) goto e60;
TS[I][J] -= TS[P1][J] * TS[I][P2] / TS[P1][P2];
e60:;}
e70:;}
TS[P1][P2] = 1.0 / TS[P1][P2];
for (J=1; J<=NV+1; J++) {
if (J == P2) goto e100;
TS[P1][J] *= fabs(TS[P1][P2]);
e100:;}
for (I=1; I<=NC+1; I++) {
if (I == P1) goto e110;
TS[I][P2] *= TS[P1][P2];
e110:;}
}

void Optimize() {
int I,J;
for (I=2; I<=NC+1; I++)
if (TS[I][1] < 0.0) XERR = 1;
NOPTIMAL = 0;
if (XERR == 1) return;
for (J=2; J<=NV+1; J++)
if (TS[1][J] > 0.0) NOPTIMAL = 1;
}

void Results() {
//Labels: e30,e70,e100;
int I,J;

if (XERR == 0) goto e30;
printf(" NO SOLUTION.\n"); goto e100;
e30:for (I=1; I<=NV; I++)
for (J=2; J<=NC+1; J++) {
if (TS[J][0] != 1.0*I) goto e70;
printf(" VARIABLE #%d: %f\n", I, TS[J][1]);
e70: ;}
printf("\n ECONOMIC FUNCTION: %f\n", TS[1][1]);
e100:printf("\n");
}

void main() {

Data();
Simplex();
Results();

}

//end of file simplex.cpp
//hi guys whats wrong with this code? cant find answers yet(

[Gaminic]

Please use code tags if you expect us to read your code.

Secondly, you'll need to specify the problem before we can help you.


My first guess would be that your compiler requires main() to return an int, so change this: void main() { to int main() { and add return 0; to the end of main.

If it's not that, you'll have to provide more information.