Question

c++文件处理，如何有效的读取类似二维数组的数据

Answer 1

#include <iostream>#include <cstdio>#include <cstring>#include <string> using namespace std; int main (){ string PATH(""); int row = 0,col = 0; printf("input path:\n"); getline(cin,PATH); printf("input rows and columns\n"); scanf("%d%d",&row,&col); if(row<0||col<0) { printf("wrong size!\n"); return -1; } FILE*fp = fopen(PATH.c_str(),"r"); if(fp==NULL) { printf("wrong path\n"); return -1; } float array[row][col]; for(int i=0; i <row; ++ i) for(int j=0; j <col; ++ j) { fscanf(fp,"%f",&array[i][j]); } fclose(fp); for(int i=0; i <row; ++ i) { for(int j=0; j <col; ++ j) { printf("%f ",array[i][j]); } printf("\n"); } return 0;}