[問題]C 程式除錯

看板C_and_CPP作者j75466 (阿弟仔)時間15年前 (2009/05/29 14:23)推噓6(6推 0噓 8→)

留言14則, 11人參與討論串1/1

#include <stdio.h> #include<stdlib.h> void dumpmatrix(int n,int*p){ int i,j; for(j=0;j<n;j++){ for(i=0;i<n;i++) { printf("a[%d,%d]=%d,",j,i,*p++); } printf("\n"); } } int*makematrix(int n,int*m,int col,int*newm){ int i,j; int*p=newm; for(j=n;j<n*n;j+=n) { for(i=0;i<n;++i) { if(i!=col) *p++=*(m+j+i); } } printf("previous matrix\n"); dumpmatrix(n,m); printf("cofactor by %d\n",col); dumpmatrix(n-1,newm); return newm; dumpmatrix(n-1,newm); return newm; } int det(int n,int*m) { int i,mydet; int*newm; if(n==2) return *m * *(m+3) - *(m+1) * *(m+2); for(mydet=i=0;i<n;++i) { if(*(m+i)!=0){ newm=(int*)malloc(sizeof(int)*(n-1)*(n-1)); mydet+=(i&1?-1:1)* *(m+i) * det(n-1,makematrix(n,m,i,newm)); free(newm); } } return mydet; } int determinant(int n,int*m){ int ntotal=n*n; int value,sum; int i,j,k; for(sum=0,i=0;i<ntotal;i+=n) { printf("det %d\n",i); value=1; for(j=0,k=i;j<n;++j,k=(k+n+1)%ntotal) { value=1; for(j=0,k=i;j<n;++j,k=(k+n+1)%ntotal) { value*=*(m+k); printf("*m[%d]=%d, value=%d\n",k,m[k], value); } sum+=value; } for(i=n-1;i<ntotal;i+=n) { printf("det %d\n",i); value=1; for(j=0,k=i;j<n;++j,k=(k+2)%ntotal) { value*=*(m+k); printf("*m[%d]=%d, value=%d\n",k,m[k], value); } sum-=value; } if(sum<0)sum= -sum; return sum; } main(int argc,char*argv[]) { int x[100]; int i; for(i=2;i<argc;++i)x[i-2]=atoi(argv[i]); dumpmatrix(atoi(argv[1]),x); printf("det=%d\n",det(atoi(argv[1]),x)); } -- ※ 發信站: 批踢踢實業坊(ptt.cc) ◆ From: 114.42.49.245

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