ECE160 Exam 1 Cheat Sheet

A cheat sheet in English by codebrent2

ECE160

10,575 views 3,346 downloads 2 Oct 2014 History

PRs

4.9 avg · 1 rating

Must-Know

int	-2,147,483,648 to +1,147,483,647
float	4bytes,contain 1 digit/decimal, +-10^38, 7digitsprecision,f, illegalfloats: 6.2.2f,6.-3f,6.2
double	8bytes,+-10^308,14digitprecise
variable	upper/lowercase differ, reflects data stored, given to memory location
destructive read	Reference
destructive write	Write Over
types of c statements	declarations/arithmetic instructions/control instructions
Order of Operations (L->R)	!, * / %, + -, < > <= =>, == !=, &&, \|\|, =
Functions	AND (&&), OR (\|\|), NOT (!)
QuadFormula	(-b+sqrt((b*b)-4ac))/(2a)
While Loop	executed 0 or more times. Does test, then body
Do-While Loop	executed 1+ times. Does body, then test
absolute value	abs(#)

Formatting Printf

printf("%6d",123);
printf("%03d",5);
printf("%7.2f",6.789);

OUTPUTS WITHOUT SPACES
output: _ _ _ 1 2 3
output: 005
output: _ _ _ 6 . 7 9

Do While Loop (b)

i=5;
do
{
printf(i);
i++;
}
while(i>3);

Executed 1+ times. Output: 5

While Loop (b)

k=7;
while(k<5)
{
printf("%d", k);
k++;
}

Executed 0+ times. Output: (nothing)

Switch-Case

int dc;
scanf(“%lf”, dc);
switch(dc) //can only switch a non double/non float 
{
	case 0 : printf (“switch case statement 1”);
	break;
	case 1 : printf(“switch case statement 2”);
	break;
	default; //do default case, below this line
	printf(“DEFAULT CASE”);
	break;
}

Logical If

If(logical expression)
{
	//block of code
}
else
{
	//statement if false
}

For Loop (a)

for(i=0;i<10;i++) //INIT, TEST, LOOP ALTER
{
printf("%d",i); //BODY
}

Rewrite of While Loop (a)

While Loop (a)

i=0; //INIT
while(i=0); //TEST
{
printf("%d",i); //BODY
i++; //LOOP ALTER
}

Rewrite of For Loop (a)

Pyramid Code Snippet

for(r=0;r<7;r++) //outer: 7 rows
{
for(s=0;s<r;s++) //controls spaces
{
printf(" ");
}
for(a=0;a<____*r;a++) //MATH 
{
printf("*"); //controls stars
}

Pyramid Math

r	# stars
0	11
1	9

1) Find m: m=(y2-y1)/(x2-x1)
2) Find equation: b=y=mx
3) Use equation in blank in code
*y=ANSWER

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