44 lines
747 B
C++
44 lines
747 B
C++
// 模仿二维数组，使用引用调用和引用返回，把函数代码补完整。
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#include <bits/stdc++.h>
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using namespace std;
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struct twodim {
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int r;
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int c;
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float *a;
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};
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void get_twodim(twodim &s, int row, int col) {
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// 初始化数组
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s.r = row;
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s.c = col;
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s.a = new float[s.r * s.c];
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}
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float &val(twodim &s, int i, int j) {
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// 返回i行j列的值
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return s.a[i * s.c + j];
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}
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void free_twodim(twodim &s) {
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// 释放数组空间
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delete[] s.a;
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}
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int main() {
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struct twodim s;
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int i, j;
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get_twodim(s, 3, 4);
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for (i = 0; i < 3; i++)
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for (j = 0; j < 4; j++)
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val(s, i, j) = i + j;
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for (i = 0; i < 3; i++) {
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for (j = 0; j < 4; j++)
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cout << setw(5) << val(s, i, j);
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cout << endl;
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}
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free_twodim(s);
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return 0;
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} |