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int zerocheck(float a,float b,float c,int d){
if(a==0){
if(b==0){
if(c==0)return 0;
else return 1;
}else{
if(d==1){
y_1=c/b;
return 2;
}else{
y2=c/b;
return 2;
}
}
}else{
if(b==0){
if(d==1){
x1=c/a;
return 3;
}else{
x2=c/a;
return 3;
}
}else{
return 4;
}
}
}
int main() {
float a,b,c,d,e,f;
int ch1,ch2;
.....
ch1=zerocheck(a,b,c,1);
ch2=zerocheck(d,e,f,2);
if(ch1==1)printf("\nNo answer. 0*X + 0*Y = %f",c);
if(ch2==1)printf("\nNo answer. 0*X + 0*Y = %f",f);
if(ch1==0 && ch2==0)printf("\nAny variable is answer!");
if(ch1==0 && ch2==2)printf("\nX - any. Y = %f",y2);
if(ch1==0 && ch2==3)printf("\nX = %f. Y - any",x2);
if(ch1==0 && ch2==4)printf("\n%f*X + %f*Y = %f",d,e,f);
if(ch1==2 && ch2==0)printf("\nX - any. Y = %f",y_1);
if(ch1==2 && ch2==2){
if(y_1==y2)printf("\nX - any. Y = %f",y_1);
else printf("\nY1 (%f) != Y2 (%f)",y_1,y2);
}
if(ch1==2 && ch2==3)printf("\nX = %f. Y = %f",x2,y_1);
if(ch1==2 && ch2==4){
y2=y_1;
x2=(f-e*y2)/d;
printf("\nX = %f. Y = %f",x2,y_1);
}
if(ch1==3 && ch2==0)printf("\nX = %f. Y - any",x1);
if(ch1==3 && ch2==2)printf("\nX = %f. Y = %f",x1,y2);
if(ch1==3 && ch2==3){
if(x1==x2)printf("\nX = %f. Y - any",x1);
else printf("\nX1 (%f) != X2 (%f)",x1,x2);
}
if(ch1==3 && ch2==4){
x2=x1;
y2=(f-d*x2)/e;
printf("\nX = %f. Y = %f",x1,y2);
}
if(ch1==4 && ch2==0)printf("\n%f*X + %f*Y = %f",a,b,c);
if(ch1==4 && ch2==2){
y_1=y2;
x1=(c-b*y_1)/a;
printf("\nX = %f. Y = %f",x1,y2);
}
if(ch1==4 && ch2==3){
x1=x2;
y_1=(c-a*x1)/b;
printf("\nX = %f. Y = %f",x2,y_1);
}
if(ch1==4 && ch2==4){
if(a/b==d/e)printf("\nNo answer. Lines would be parallel or qeual.");
else{
x1=(b*f-c*e)/(d*b-a*e);
y_1=(c-a*x1)/b;
printf("\nX = %f. Y = %f",x1,y_1);
}
}
printf("\n");
print_lines();
return 0;
}
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