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cs2010 Notes: 03 Expressing Algos

··1 min

ex 1 #

Here’s some pseudocode:

input a
input b
if (a > b)
    larger = a
else
    larger = b
output larger

Let’s make it a flowchart: https://app.code2flow.com/

Let’s make it C code:

#include <stdio.h>

int
main(int argc, char* argv[]) {
  int a, b, c;

  puts("What's a?");
  scanf("%d", &a);
  puts("What's b?");
  scanf("%d", &b);

  if (a > b) {
    c = a;
  }
  else {
    c = b;
  }

  printf("The larger value is: %d\n", c);
  return 0;
}

Let’s make it an IPO Table

inputs: a, b

process:

if (a > b) larger = a else larger = b

output: larger

To show the variety of code, let’s make it a web page.

ex 2 #

Multiplication by repeated addition:

input a, b
set c = 0
while b > 0:
    set c = c + a
    set b = b - 1
output c

For code, let’s write it in Python with intermediate prints.

Then let’s write it in j

more #

  • Sum all odd positive integers less than x
  • Determine which name is longer
  • Determine if a number is prime