수다닷컴

오류 문제.질문 요약 :오류가 났는데 어디서 오류가 난지를 모르겠네요질문 내용 :하단에 오류내용들 Trapezoid 에 함수 설정? 이 안됐다고 하는거같은데 찾을수가 없어요 - ㅅ-

에러 내용 : Lingker Warning : No module definition file specified unsing defaults
　　　　　　Linker Error : Undefined symbol trapezoid[int,int,int] in module Q3.c

#includestdio.h
#define PI 3.14
int main_inter_face();
int tri();
int squ();
int cir();
int rect();
int trap();
float triangle(int ni, int n2);
float square(int n1);
float circle(int n1);
float rectangle(int n1, int n2);
float trapezoid(int ni, int n2, int n3);
void main() {
int number;
printf(1. Triangle\n2. Square\n3. Circle\n4. Rectangle\n5 Trapezoid\n6 Quit\n);
while(1) {
number = main_inter_face();
switch(number) {
case 1: tri();break;
case 2: squ();break;
case 3: cir();break;
case 4: rect();break;
case 5: trap();break;
case 6: break;
default : printf(Again\n);
}
if(number==6) break;
}
}
int main_inter_face() {
int num;
printf(please enter menu number : );
scanf(%d,&num);
return(num);
}
int tri() {
int num1,num2;
float num4;
printf(Length1: );
scanf(%d,&num1);
printf(Length2: );
scanf(%d,&num2);
num4 = triangle(num1,num2);
printf(The area is %f\n,num4);
}
int squ(){
int num1;
float num4;
scanf(%d,&num1);
num4 = square(num1);
printf(The area is %f\n,num4);
}

int cir() {
int num1;
float num4;
printf(Length1: );
scanf(%d,&num1);
num4 = circle(num1);
printf(The area is %f\n, num4);
}
int rect() {
int num1,num2;
float num4;
printf(Length1: );
scanf(%d,&num1);
printf(Length2: );
scanf(%d,&num2);
num4 = rectangle(num1,num2);
printf(The area is %f\n,num4);
}
int trap() {
int num1,num2,num3;
float num4;
printf(Length1: );
scanf(%d,&num1);
printf(Length2: );
scanf(%d,&num2);
printf(Height: );
scanf(%d,&num3);
num4 = trapezoid(num1,num2,num3);
printf(The area is %f\n,num4);
}
float triangle ( int n1, int n2) {
float n3;
n3 = (n1 * n2)/ 2;
return(n3);
}
float square(int n1) {
float n2;
n2 = n1*n1;
return(n2);
}
float circle(int n1) {
float n2;
n2 = n1 * n1*PI;
return(n2);
}
float rectangle(int n1, int n2) {
float n3;
n3 = n1 * n2;
return(n3);
}
float tapezoid(int n1, int n2, int n3) {
float n4;
n4 = (n1+n2)*n3/2;
return(n4);
}

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