this is my program so far but i\'m getting errors. can someoneplease help me out

Question

this is my program so far but i'm getting errors. can someoneplease help me out? thanks.

#include <stdio.h>
#include <math.h>
//#define comes here
//Function prototypes come here
int main(void)
{
{
        int rows, cols, row,col;
        double **a, *b, *c,sum;
        FILE *infile;
        infile =fopen("matrix5.dat", "r");
        fscanf(infile, "%d %d",&rows, &cols);
       printf("rows=%d    cols=%d ", rows, cols);
          a = (double**)calloc((size_t)rows, sizeof(double *));
        for(row=0; row<rows;row++){
          a[row]=(double *)calloc((size_t)cols, sizeof(double));
        }
        for(row=0; row<rows;row++)
          for(col=0; col<cols; col++) fscanf(infile, "%lf",a[row]+col);

       printf(" a[][]: ");
        for(row=0; row<rows;row++){
        printf("a[%d] ",row);
        for(col=0; col<cols;col++){
        printf("%9.3f",a[row][col]);
        if((col+1)%10 == 0)printf(" ");
        }
        printf(" ");
}


        b = (double*)calloc((size_t)rows, sizeof(double *));
        c = (double*)calloc((size_t)rows, sizeof(double *));

               for(row=0; row<rows; row++)
          for(col=0; col<cols; col++) fscanf(infile, " %lf", b + col);

        printf("b[] ",row);
        for(col=0; col<cols;col++){
        printf("%9.3f",b[col]);
        if((col+1)%10 == 0)printf(" ");
        }
printf(" ");
         for(row=0;row<rows; row++){
          for(col=0,sum=0.0; col<cols; col++)
               sum += a[row][col]*b[col];
          c[row]=sum;
        }
        //print c[]
        printf("c[]={");
        for(row=0; row<rows;row++) printf(" %9.3f", c[row]);
        printf(" } ");
{
        free(infile);
        for(i=0; i<rows;i++){
               free(a[i]);
}
free(a);
free(b);
free(c);
exit(0);
}

}

this is my error:

q.c:54: error: `i' undeclared (first use in this function)
q.c:54: error: (Each undeclared identifier is reported onlyonce
q.c:54: error: for each function it appears in.)

Explanation / Answer

//Hope this will help you.. //Don't forget to rate it.. #include #include #include //#define comes here //Function prototypes come here int main(void) {         int rows, cols, row,col;         double **a, *b,*c,sum;         FILE *infile;         infile =fopen("matrix5.dat", "r");         fscanf(infile, "%d %d",&rows, &cols);        printf("rows=%d    cols=%d ", rows, cols);           a = (double**)calloc((size_t)rows, sizeof(double *));         for(row=0; row

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