如何在 C 中读取 .txt 文件并将数字存储到二维数组中

Question

So I have the following Matrix in a .txt file given to me by my professor:

3.000000,1.000000,1180.000000,1955.000000,221900.000000
3.000000,2.250000,2570.000000,1951.000000,538000.000000
2.000000,1.000000,770.000000,1933.000000,180000.000000
4.000000,3.000000,1960.000000,1965.000000,604000.000000
3.000000,2.000000,1680.000000,1987.000000,510000.000000
4.000000,4.500000,5420.000000,2001.000000,1230000.000000
3.000000,2.250000,1715.000000,1995.000000,257500.000000
3.000000,1.500000,1060.000000,1963.000000,291850.000000
3.000000,1.000000,1780.000000,1960.000000,229500.000000
3.000000,2.500000,1890.000000,2003.000000,323000.000000

and I'm suppose to be able to store the first 4 elements in each row into a 2D array. However, I can't seem to figure out how to do it for a 2D array. Any suggestions?

Edit: Here is what I have so far:

int main(int argc, char *argv[]){
FILE *train; 
FILE *test; 
int row,cols;
int num = 0; 
char single [150]; 
char single1 [150]; 
train = fopen(argv[1],"r");
test = fopen(argv[2],"r");
if(argc < 3){
    printf("error\n");
    return 0; 
}
char *a = fgets(single,150,train);
int attributes = atoi(a); 
char *b = fgets(single,150,train); 
int examples = atoi(b); 
printf("%d\n%d\n\n",attributes,examples);
int matX[attributes][examples]; 

for(row = 0; row < attributes;row++){
    for(cols = 0; cols < examples;cols++){
        matX[row][cols] = atoi(fgets(single,150,train)); 
    }
}
printArray(row,cols,matX);

attributes is the number of elements i have to store from each row, and examples is the number of rows in the Matrix. Is this method even viable?

Answer 1

you could try sscanf

char line ="3.000000,1.000000,1180.000000,1955.000000,221900.000000";
float v0, v1, v2, v3;
sscanf(line, "%f,%f,%f,%f", &v0, &v1, &v2, &v3);