Note:

x += 1;  //is shorthand for
x = x + 1;

// Test if a point is inside a triangle.
// Julian Saknussemm
//
// Given Three points of a triangle, and another arbitrary point this program determines if that point lies inside
// the triangle.
//
// This is determined by satisfying the following rule:
// A point P(x,y) is inside triangle A(x0,y0), B(x1,y1), C(x2,y2)
// iff
// P is on the same side of the line AB as C
// P is on the same side of the line BC as A
// and
// P is on the same side of the line AC as B
//
// A special case exits for a vertical line (inf gradient) when testing the side of the line

#include <stdio.h>

int test2( double px, double py, double m, double b )
{   if( py < m * px + b ) {
        return -1; // point is under line
           }else if ( py == m * px + b ){
           return 0;
           } else {
           return 1; // over
        }
}

int // two points lie on the same side of a line
test1( double px, double py, double m,double b, double lx,double ly) {
        return (test2( px,py, m,b )==test2(lx,ly,m,b));
}
int tritest(double x0,double y0,double x1,double y1,double x2,double y2,double px, double py){

        int line1, line2, line3;
// line eqns

double m01 = (y1-y0)/(x1-x0);
// b: y - y1 = m( x - x1 ), x = 0
double b01 = m01 * -x1 + y1;
double m02, m12, b02, b12;
m02 = (y2-y0)/(x2-x0);
m12 = (y2-y1)/(x2-x1);
b02 = m02 * -x2 + y2;
b12 = m12 * -x2 + y2;

// vertical line checks
if( x1 == x0 ) {
   line1 = ( (px <= x0) == (x2 <= x0) );
} else {
   line1 = test1( px, py, m01, b01,x2,y2);
}

if( x1 == x2 ) {
        line2 = ( (px <= x2) == (x0 <= x2) );
} else {
        line2 = test1(px,py, m12, b12,x0,y0);
}

if( x2 == x0 ) {
line3 = ( (px <= x0 ) == (x1 <= x0) );} else {
        line3 = test1(px, py, m02,b02,x1,y1);
}

   return line1 && line2 && line3;

}
int main(void) {
double x0,y0,x1,y1,x2,y2,px;
double py;

int scanfsReturnValueAggregatedOverAllScanfs = 0;

// get input
        printf("Triangle Vertex A (x,y): "); scanfsReturnValueAggregatedOverAllScanfs += scanf("%lf,%lf", &x0,&y0);
        printf("Triangle Vertex  B (x,y): "); scanfsReturnValueAggregatedOverAllScanfs += scanf("%lf,%lf", &x1,&y1);
        printf("Triangle Vertex  C (x,y): "); scanfsReturnValueAggregatedOverAllScanfs += scanf("%lf,%lf", &x2,&y2);
   printf("Test Point (x,y): "); scanfsReturnValueAggregatedOverAllScanfs += scanf("%lf,%lf", &px,&py);

// print error
   if( scanfsReturnValueAggregatedOverAllScanfs != 8 ) {
                printf("You're stupid and didn't put in the right inputs!\n");
                return 1;
}

// print answer
   printf("Point (%.2lf,%.2lf) is ", px,py);
   if(tritest(x0,y0,x1,y1,x2,y2,px,py)) printf("inside");
   else printf("outside");
   printf(" the Triangel\n");

// return 0
return 0;
}

It should behave in the following way

./integerCounter
Enter a number: 1
You have entered 1 1 times
Enter a number: 1
You have entered 1 2 times
Enter a number: 99
You have entered 99 1 times
Enter a number: 3
You have entered 3 1 times
Enter a number: -1
Try again: number has to be between 0 and 99 inclusive
Enter a number: 3
You have entered 3 2 times
Enter a number: 

#include <stdio.h>

int main(void) {
    int x = 'B';
    printf("%c\n",x+1);
    return 0;
}

The only functions you can use are getchar and putchar.

For example:

./upper_case
I'm very angry that you ate my chips!!!!!!
I'M VERY ANGRY THAT YOU ATE MY CHIPS!!!!!!

It should do the same for upper case leters.

Other characters should be unchanged.

The only functions you can use are getchar and putchar.

For example:

./encrypt
Zulu Kilo Alpha proceed to Foxtrot Juliet at 1900 HOURS.
Avmv Ljmp Bmqib qspdffe up Gpyuspu Kvmjfu bu 1900 IPVST.

Again the only functions you can use are getchar and putchar.

For example:

./decrypt
Avmv Ljmp Bmqib qspdffe up Gpyuspu Kvmjfu bu 1900 IPVST.
Zulu Kilo Alpha proceed to Foxtrot Juliet at 1900 HOURS.

When the end of input is reached it should print a count of how many digits occured in its input and their sum.

The only functions you can use are getchar and printf.

For example:

./sum_digits
1 2 3 o'clock
4 o'clock rock
Input contained 4 digits which summed to 10
./sum_digits
12 twelve 24 twenty four
thirty six 36
Input contained 6 digits which summed to 18

#include <stdio.h>

int main(void) {
    char str[10];
    str[0] = 'H';
    str[1] = 'i';
    printf("%s", str);
    return 0;
}

1. What will happen when the above program is compiled/run?

2. How do you correct the program.

The only functions you can use are fgets and printf.

You can assume lines contain at most 4096 characters.

For example:

./line_length
C Rocks
line 7 characters long
A very long line.
line 17 characters long
short
line 5 characters long

line 0 characters long

For example:

./reverse
The quick brown fox jumped over the lazy dog.
.god yzal eht revo depmuj xof nworb kciuq ehT
It was the best of times. It was the worst of times.
.semit fo tsrow eht saw tI .semit fo tseb eht saw tI
This is the last line.
.enil tsal eht si sihT
<control-d>

In another words remove lines are empty or contain only white-space.

The only functions you can use are fgets and printf.

You can assume lines contain at most 4096 characters.

You can assume there are only 3 white space characters, space, tab & new-line.

For example:

./filter_empty_lines
full line
full line
         
another no-empty line
another no-empty line

The only functions you can use are fgets and printf.

You can assume lines contain at most 4096 characters.

For example:

./strip_comments
x = x + 1;  // This means add one to the variable x
x = x + 1;

• outputs the number of white-space characters (spaces, tabs and new lines)
• outputs the numbers of words word (any contiguous sequence of non-white-space characters), and
• outputs the length of the shortest word
• outputs the length of the longest word

For example:

./input_statistics
    "Beauty is truth, truth beauty," ? that is all
    Ye know on earth, and all ye need to know.
Input contains 27 blanks, tabs and new lines
Number of words: 19
Length of shortest word: 2
Length of longest word: 8
./input_statistics
And here is another example with only one line of input!!!!!!!!!
Input contains 11 blanks, tabs and new lines
Number of words: 11
Length of shortest word: 2
Length of longest word: 14

./letter_triangle
Enter height: 3
  A
 BCB
DEFED
./letter_triangle
Enter height: 7
      A
     BCB
    DEFED
   GHIJIHG
  KLMNONMLK
 PQRSTUTSRQP
VWXYZABAZYXWV
./letter_triangle
Enter height: 10
         A
        BCB
       DEFED
      GHIJIHG
     KLMNONMLK
    PQRSTUTSRQP
   VWXYZABAZYXWV
  CDEFGHIJIHGFEDC
 KLMNOPQRSRQPONMLK
TUVWXYZABCBAZYXWVUT