已知
file1 file2
x1 x2 x3... y1 y2 y3...
x4 x5 x6... y4 y5 y6...
................ .................
file1 and file2行数列数相同
编程建立
file3
z1 z2 z3....
z4 z5 z6....
..................
满足zn = xn + yn
note
1.EOF is an indicator, a const int ,default set as -1
2.feof is a function -- int feof(FILE * stream)
returning an non-zero indicator(which is equal to EOF) if reach the end of file,else return 0.
3.a way to turn char into int
char a; //set as what you want
int b = a - '0';
#include<stdio.h> int readfile(const char *, int *, int *, int *); void writefile(const char *, int, int, int*); int main() { int mrow, mcol; int all; int num1[100] = {0}; int num2[100] = {0}; int num3[100] = {0}; int count = 0; all = readfile("./file1", &mrow, &mcol, num1); readfile("./file2", &mrow, &mcol, num2); printf("all = %d\n", all); for(count = 0; count <= all; count++) { num3[count] = num1[count] + num2[count]; } writefile("./file3", mrow, mcol, num3); return 0; } void writefile(const char * path, int mrow, int mcol, int* num3) { FILE *fp = fopen(path, "w"); if(fp == NULL) { perror("writefile"); return; } int cr = 0, cc = 0; int c = 0; while(num3[c] != 0) { for(cr = 0; cr < mrow; cr++) { for(cc = 0; cc <= mcol; cc++) { fprintf(fp, "%d", num3[c]); c++; if(cc != mcol) { fprintf(fp, " "); } } fprintf(fp, "\n"); } } fclose(fp); return; } int readfile(const char * path, int * mrow, int * mcol, int num1[]) { FILE * fd = fopen(path, "r"); if(fd == NULL) { perror("open file1"); return 1; } char c; char buf1[100]; int i = 0; while((c = fgetc(fd)) != EOF) { buf1[i] = c; i++; } i = 0; int a = 0; int t = 0; int col = 0; int row = 0; int flag = 0; while(buf1[i + 1] != '\0') { if(buf1[i] == ' ') { a++; i++; if(flag == 0) { col++; } continue; } if(buf1[i] == '\n') { a++; i++; row++; flag = 1; continue; } t = buf1[i] - '0'; num1[a] = 10 * num1[a]; num1[a] = num1[a] + t; i++; } *mrow = row; *mcol = col; fclose(fd); return a; }
