write a C program (not C++) + Students are not allowed to use input/output statements for questions 1 to 4. All input data must be passed vie function argument, and the output should return by arguments or return value. 1. Write a function to calculate area of a triangle. (2 marks) Hint: Formula for triangle area: S= bottom_edge x height /2 or S=ඥpሺp െ aሻሺp െ bሻሺp െ cሻ with p=(a+b+c)/2. a,b,c are 3 sides of triangle. The function should return ‐1 for invalid triangle. 2. Write a function to check whether a string is padlindrom? (1 mark) Padlindrom is a symmetric string. Ex: ABBA is padlindrom string. 3. Write a function to calculate the sum of arithmetic sequence (2 marks) S= 1‐ ଵ ଶ ൅ ଵ ଷ െ ଵ ସ േ ଵ ௡ with | ଵ ௡ |>e e is a lower bound value for the last element of sequence. (negative sign for even number and possitve sign for odd number element of the sequence.) 4. Write a function that generate an array of integer that has k elements wih random value between m and n (2 marks) Hint: rand() return a random integer between 0 and 32767. 5. Write main() function to invoke the 4 functions above: + Offer text menu for user choice to execute the functions.(1 mark) + For each choice, demostration of successfully running the selected function (0.5 mark for each)

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Author:James Kurose, Keith Ross
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write a C program (not C++)

+ Students are not allowed to use input/output statements for questions 1 to 4. All input data must be
passed vie function argument, and the output should return by arguments or return value.
1. Write a function to calculate area of a triangle. (2 marks)
Hint: Formula for triangle area: S= bottom_edge x height /2 or S=ඥpሺp െ aሻሺp െ bሻሺp െ cሻ with
p=(a+b+c)/2. a,b,c are 3 sides of triangle.
The function should return ‐1 for invalid triangle.
2. Write a function to check whether a string is padlindrom? (1 mark)
Padlindrom is a symmetric string. Ex: ABBA is padlindrom string.
3. Write a function to calculate the sum of arithmetic sequence (2 marks)
S= 1‐


൅ ଵ
ଷ െ ଵ
ସ േ ଵ
௡ with | ଵ

|>e e is a lower bound value for the last element of sequence.
(negative sign for even number and possitve sign for odd number element of the sequence.)
4. Write a function that generate an array of integer that has k elements wih random value
between m and n (2 marks)
Hint: rand() return a random integer between 0 and 32767.
5. Write main() function to invoke the 4 functions above:
+ Offer text menu for user choice to execute the functions.(1 mark)
+ For each choice, demostration of successfully running the selected function (0.5 mark for
each)

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