请大侠帮我看看下面的程序问题出在哪里~~~急用~~~
#include<stdio.h>
#include<conio.h>
int JDW[150][3],NTJ[150][4],N1,N2;
void main()
{
    int i,j,NA;
    void output();
    void nobeam();
    void nopier();

        printf("输入总的节点编号个数和从节点个数N1 N2\n");
        scanf("%d%d",&N1,&N2);
        for(i=0;i<N1;i++)
            for(j=0;j<3;j++)
                JDW[i][j]=0;
        printf("      以如下格式输入从节点信息:\n");
        printf("        n    *    *    *\n");
        printf("      （从节点号） （x,y,z的约束信息）\n");
        printf("      其中，x,y,z的约束信息规定如下：\n");
        printf("      (1)独立节点位移分量输0；\n");
        printf("      (2)支座约束输-1；\n");
        printf("      (3)位移与主节点相同输主节点号。\n");
        printf("      例如：\n");
        printf("          2 1 1 0\n");
        printf("          4 0 -1 0\n");
        printf("          6 5 5 0\n");
                                                                  
        for(i=0;i<N2;i++)                                   
            for(j=0;j<4;j++)
                scanf("%d",&NTJ[i][j]);

        for(i=0;i<N2;i++)                                         
        {
            int k,h;
            k=NTJ[i][0];
            for(j=0,h=0;h<3;h++)
                JDW[k-1][h]=NTJ[i][h+1];
        }

        printf("\n计梁柱轴向变形时，输入0\n");                     
        printf("\n不计梁轴向变形时，输入1\n");
        printf("\n不计柱轴向变形时，输入2\n");
        printf("\n不计梁柱轴向变形时，输入3\n");
        scanf("%d",&NA);

        if(NA==0)
        {
            void output();
        }


        else if(NA==1)
        {
            void nobeam();
            void output();
        }   
   
        else if(NA==2)
        {
            void nopier();
            void output();
        }


        else if(NA==3)
        {
            void nobeam();
            void nopier();
            void output();
        }
        getch();
}


void output()
{
    int k=1,i,j,t;
    for(i=0;i<N1;i++)
        for(j=0;j<3;j++)
        {
            if(JDW[i][j]<0)
                JDW[i][j]=0;
            else if(JDW[i][j]==0)
                JDW[i][j]=k++;
            else
            {
                t=JDW[i][j];
                JDW[i][j]=JDW[--t][j];
            }
            }
        printf("节点定位向量如下：\n");
        for(i=0;i<N1;i++)
            {
                for(j=0;j<3;j++)
                    printf(" %d ",JDW[i][j]);
                    printf("\n");
            }
        }


void nobeam()
{
    int a[150]={0},i,j,n;
    printf("输入水平梁段数目：\n");
    scanf("%d",&n);
    for(i=1;i<=n;i++)
        {
            printf("输入%d段水平梁段的最大节点编号：\n",i);
            scanf("%d",&a[i]);
            for(j=a[i-1]+1;j<a[i];j++)
                JDW[j][0]=a[i-1]+1;
        }
}


void nopier()
{
    int i;
    for(i=0;i<N1;i++)
        JDW[i][1]=-1;
}

感谢大侠帮忙解决问题！
由于本人还要继续学习c语言，所以，想请大侠解释下为什么调用时把void去掉。