文件内容
2
3 2
1 4 1 1 0 11
4 1 1 1 8 11
2 5 0 0 0 11
4 1 0 0 0 11
5 5
2 4 1 0 1 13
4 4 0 1 12 13
1 4 1 1 0 13
3 5 1 1 7 13
一、格式读取
1. C语言
FILE * f_in = fopen("1.txt", "r");
int k;
int m, n;
int dp[];
fscanf(f_in, "%d", &k);
while (k--) {
fscanf(f_in, "%d %d", &m, &n);
for (int i = ; i < ; ++i) {
fscanf(f_in, "%d %d %d %d %d %d", &dp[], &dp[], &dp[], &dp[], &dp[], &dp[]);
}
}
2. C++ >>输入运算符遇到空白字符就停止输入，但把空白字符留在缓冲区
ifstream f_in("1.txt");
int k;
int m, n;
int dp[];
f_in >> k;
while (k--) {
f_in >> m >> n;
for (int i = ; i < ; ++i) {
f_in >> dp[] >> dp[] >> dp[] >> dp[] >> dp[] >> dp[];
cout << dp[] << "," << dp[] << "," << dp[] << "," << dp[] << "," << dp[] << "," << dp[] << endl;
}
}
二、读取一行
C++
getline一直读到换行符，从输入缓存读取换行符并把换行符丢弃
ifstream f_in("1.txt");
string str;
while (getline(f_in, str)){
cout << str << endl;
}
C语言 fgets读取并丢掉换行符
FILE* f_in = fopen("1.txt", "r");
char str[];
while (fgets(str, , f_in)){
cout << str;
}