CP Introduction to C

1. CP Introduction to C And c++?

2. What will we do? • C vs JAVA • Dev-C++ tutorial and your first program • C++ structure • Reading input/output • Flow Control (if, for, while) • array • function (method) • debugging

3. Hello World (Day 1 Morning) C JAVA import java.io.*; class HelloWorldApp { public static void main(String[] args) { System.out.println("Hello World!"); } } #include <stdio.h> int main(intargc, char* argv[]) { printf("Hello, CP!\n"); return 0; }

4. C vs JAVA • C code DOES NOT need to be in a class • No filename restriction • C and JAVA have very similar syntax • if, for, while is the same • Data type is almost the same (int, char, bool, float, double, etc) • Function and method is the same • For c++, function does not need to be in a class • We don’t really use any class in algorithm :D

5. Output (printf) printf(format_string, value…);

6. input(scanf) Use the same format string scanf(format_string, &variable…); #include <stdio.h> int main() { int age, w; printf("Please enter your age and weight”); scanf("%d %d", &age, &w); printf(“your age = %d \n your weight is %d\n”,age,w); }

7. Condition Statement • If statement • The same as java #include <stdio.h> int main() { int age; printf( "Please enter your age" ); scanf( "%d", &age ); if ( age < 100 ) { printf ("You are NOT old!\n" ); } else { printf ("You are old!\n" ); } return 0; }

8. While loop • While loop • The same as java #include <stdio.h> int main() { int x = 0; while ( x < 10 ) { printf("x = %d\n",x); x++; } return 0; }

9. For loop • For loop • The same as java #include <stdio.h> int main() { for (inti = 0;i < 10;i++) { printf(“i = %d\n",i); } return 0; }

10. Practice • Lab 1 (http://www.nattee.net/files-dae/Algo-Lab1.pdf) • Prob 0,1 • Lab 2 (http://www.nattee.net/files-dae/Algo-Lab2.pdf) • Prob 0,1 • hw00e (BMI) • http://www.nattee.net/~dae/algo/prob/hw00b_fibo/problem.pdf • hw00c (drawbox) • http://www.nattee.net/~dae/algo/prob/hw00c_drawbox/problem.pdf • hw00d (time after) • http://www.nattee.net/~dae/algo/prob/hw00d_timeafter/problem.pdf

11. Array in C++ (Day 1 Afternoon) (almost) the same as java #include <iostream> int main() { intfibo[100]; fibo[0] = 1; fibo[1] = 1; for (inti = 2;i < 100;i++) { fibo[i] = fibo[i-1] + fibo[i-2]; } printf("%d\n",fibo[99]); return 0; }

12. 2D Array Example #include <stio.h> int main() { int x; int y; int array[8][8]; for ( x = 0; x < 8; x++ ) { for ( y = 0; y < 8; y++ ) array[x][y] = x * y; } printf("Array Indices\n"); for ( x = 0; x < 8;x++ ) { for ( y = 0; y < 8; y++ ) printf("[%d][%d] = %d\n",x,y,array[x][y]); printf("\n"); } return 0; }

13. More practice • Lab 2 • Prob 2 • hw00f • http://www.nattee.net/~dae/algo/prob/hw00f_aminmax/problem.pdf

14. Debugging (Day 2 Morning) • Follow guide in Lab 3 • (http://www.nattee.net/files-dae/Algo-Lab3.pdf)