CS1501
Q1) In C, array name by default holds the address of the first location. You should change "scanf("%s", &s)" by "scanf("%s", s)".
    Why did you open and close the same file multiple times  (3 times) ?
    Program is not complete
Q2) Area calculation is wrong

CS1502
Q1) Either you need to open the file in "r" or "a+" mode. "a" mode is used only for appending not for reading.
    New line is represented by '\n' in C
    At the end of each string you need to add '\0'
Q2) Should check boundary conditions (n = 0 or 1, getting segmentation fault)

CS1504
Q1) Compilation error
Q2) Compilation error
    Segmentation fault (Arithmetic exception, divided by 0)
    
CS1505
Q1) You have to calculate the no. of words and the length of each word in program
    sort function is not correct

CS1506
Q1) Try to avoid file open and close multiple times

CS1507
Q1) Segmentation fault (while reading from a file and writing to a file)
    Replace void main() by int main() please
    At the end of each string you need to add '\0'
    Used wrong index variable (j instead of k)
    Please use strcpy for copying string
Q2) Replace void main() by int main() please
    b,c -> logic is not correct

CS1508
Q1) Segmentation fault 
    fprintf(S[k],"%s",c) is not correct, you have to give the file name as first argument


CS1509
Q1) Please use strcpy for copying string 
    You should take the file name as input
Should add comments

CS1510
Q1) Please use stdlib.h header for using calloc function
    Segmentation fault
    Should initialize line by 0

CS1513
Q1) fseek's arguments are wrong
    New line is represented by '\n' in C
    You need to write the function for sorting
     
CS1514
Q1) Sorting function is not correct
Q2) b,c -> Calculations are not correct
Should add more comments

CS1515
Q1) Why did you assume that the no. of words cannot be more than 40?

CS1516
Q1) Good
Q2) Area calculation is wrong

CS1517
Q1) Compilation error
    You should take the file name as input
Q2) Should check boundary conditions (n = 1, getting segmentation fault)
    Segmentation fault
Should add comments

CS1518
Q1) Compilation error
Q2) Compilation error

CS1519
Q1) Segmentation fault
Q2) while loop in isConvex method is a infinite loop (should remove the else part)
    triangleArea calculation is wrong

CS1520
Q1) Sorting function is wrong
Q2) Should check boundary conditions (n = 0 or 1, getting segmentation fault)
    void main should be replaced by int main
    Segmentation fault (for boundary condition violation in loop)
        
Programming habits need to be improved. Should add more comments

CS1522
Q1) Segmentation fault
    You should calculate the no. of words and the length of each word
Q2) The data type for points, area should be double (not int)
    The output is wrong (in area calculation)
    
CS1523
Q1) Program is not terminating
Q2) Should check boundary conditions (n = 0 or 1, program is not terminating)
    
Programming habits need to be improved, should put printf statement before takeing any input
Indentation needs to be improved

CS1524
Q1) Segmentation fault

CS1525
Q2) Should check boundary conditions (n = 0 or 1, getting segmentation fault)