我从以下代码的第二行收到段错误:
FILE *output = NULL;
output = fopen("./output2.txt", "w+");
我认为这不是某种腐败的内存错误,因为当我将w +更改为r时。它运行时没有段错误。此外,它似乎在segfaults之前创建文件。
编辑:结果是mrbatch是对的
我的所有参考代码:
void writeFile(const char *header, int numRows, int numCols, int **grades, const char *outFile)
{
printf("writefile success\n");
int i, j;
FILE *output = NULL;
output = fopen("./output2.txt", "w+"); // ERROR HERE (I was wrong, keep reading)
printf("testestestsetsete\n\n\n"); //based off the commenters, this code
//IS reached but is never printed
fprintf(output, "%s", *header); //commenters stated error is here
//*header should be header
fprintf(output, "%d %d\n", numRows, numCols); //output the number or rows and columns at the second line
//output each grades(scores) in the processed 2D array grades
for(i = 0; i < numRows; i ++ ) { //loop through all rows
for( j = 0; j < numCols; j ++ ) //loop through all columns in the i row
{
if( j < numCols - 1 )
fprintf(output, "%d ", grades[i][j]);
else
fprintf(output, "%d\n", grades[i][j]);
//printf("\"%d\" ", score);
}
//printf("\n");
}
fclose(output);
}
答案 0 :(得分:5)
错误实际上是fprintf
之后的第一个fopen
。
fprintf(output, "%s", *header); //output the same header
%s
格式说明符需要char *
并且您传递了char
值(*header
),它试图将其解释为地址并导致段错误。