Thread: What is a segmentation error?

What is a segmentation error and what are some possible causes? I'll post code, if necessary, but I not asking for someone to do my troubleshooting.

Most of the time, a segmentation fault is when you try and use a pointer when it is uninitialized, or when you try and write past the end of an array, things like that....anything having to do with memory mostly. if you post the code, we may be able to point it out.

The code is as follows...

#include <stdio.h>
#define MAXEL 10
double find_max(double [], double);
double find_min(double [], double);
double get_min_range(double list[], double first, double last);
void sel_sort(double list[], int n);


int main(void){
double nums[MAXEL];
double newInfo;
int i = 0;
int j = 0;
int k = 0;
double sum = 0;


FILE *input = fopen("lab6.in", "r");

if (input == NULL)
{
printf("Cannot open file.\n");
return(0);
}

for (k = 0; fscanf(input, "%lf", &newInfo) != NULL; j++)
nums[j] = newInfo;

fclose(input);



sel_sort(nums, 10);

printf("\nThe descending order of the array is:\n\n");
while( i < 10){

printf("%6.2f\n", nums[i]);
i++;

}
printf("\nThe maximum value in the array is %6.2f. \n", find_max(nums, 10));
printf("\nThe minimum value in the array is %6.2f. \n\n", find_min(nums, 10));


return(0);
}

double find_max(double last[], double num_ele){
int i, max = last[0];
for(i = 1; i < num_ele; i++)
if(max < last[i]) max = last[i];

return (max);
}

double find_min(double first[], double num_ele){
int i, min = first[0];
for(i = 1; i < num_ele; i++)
if(min > first[i]) min = first[i];

return (min);
}

double get_min_range( double list[], double first, double last){
int i, small_sub;
small_sub = first;

for(i = first + 1; i <= last; ++i)
small_sub = i;

return(small_sub);
}

void sel_sort(double *list, int n){
int temp;
int i;
for(i = 0; i < n - 1; i++){
int max = i;
int j = 0;

for(j = i + 1; j < n; j++){
if(list[j] < list[max]) { max = j; }
}
temp = list[max];
list[max] = list[i];
list[i] = temp;
}
}

/***********************************************/

/*** The file lab6.in reads as follows... */

5.00
2.00
3.00
8.00
10.00
7.00
4.00
1.00
0.00
9.00


/**** Thanks for your input! *****/