#include<stdio.h> void main() { int i,j,k,n; char d[20,20]; FILE *fp; fp=fopen("d:\\lan\\a.dat", "r"); printf("please input the total kind of steel\n"); scanf("%d",&n); for(k=0;i<n;k++) { i=k/4; j=k%4; fscanf(fp, "%s", d[i,j]); printf("d[%d,%d]=%s\n", i,j,d[i,j]); } fclose(fp); if((fp=fopen("b.dat","w+"))==NULL) { printf("ERROR\n"); } else { for(i=0;i<n;i++) { for(j=0;j<=4;j++) { fprintf(fp,"d[%d,%d]=%s\n",i,j,d[i,j]); } } } fclose(fp); }

#include<stdio.h> void main() { int i,j,k,n; char d[20][20]; FILE *fp; fp=fopen("d:\\lan\\a.dat", "r"); printf("please input the total kind of steel\n"); scanf("%d",&n); for(k=0,i=0;i<n;k++) { i=k/4; j=k%4; fscanf(fp, "%s", d[i][j]); printf("d[%d,%d]=%s\n", i,j,d[i][j]); } fclose(fp);

if((fp=fopen("b.dat","w+"))==NULL) { printf("ERROR\n"); } else{ for(i=0;i<n;i++) { for(j=0;j<=4;j++) { fprintf(fp,"d[%d,%d]=%s\n",i,j,d[i][j]); } } }

fclose(fp); }

我的a.dat是:

1 &25 786 54 2 $8 356 82 3 $8 452 41 4 &12 226.3 15

可是我的结果输出来都是(null)d[0,0]=(null) d[0,1]=(null) d[0,2]=(null) d[0,3]=(null) d[1,0]=(null) d[1,1]=(null) d[1,2]=(null) d[1,3]=(null) d[2,0]=(null) d[2,1]=(null) d[2,2]=(null) d[2,3]=(null) d[3,0]=(null) d[3,1]=(null) d[3,2]=(null) d[3,3]=(null)