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6.4 Examples Using Arrays
- Character arrays
- String “first” is really a static array of characters
- Character arrays can be initialized using string literals
char string1[] = "first";
- Null character '\0' terminates strings
- string1 actually has 6 elements
char string1[] = { 'f', 'i', 'r', 's', 't', '\0' };
- Can access individual characters
string1[ 3 ] is character ‘s’
- Array name is address of array, so & not needed for scanf
scanf( "%s", string2 );
- Reads characters until whitespace encountered
- Can write beyond end of array, be careful
Outline
fig06_10.c (Part 1 of 2)
Example: Students poll
- Write a program that uses poll record of 40
students. Each student have entered a value
between 1 and 10. Count frequency of each choice
in the given data set.
- Data set size 40
- Range 1-10 (ten choices)
Outline
fig06_07.c (Part 1 of 2)
Example: Histogram
- A histogram is a bar graph, where we divide the
grades into ranges and plot the number of grades
in each range. Your histogram should have 5 bars,
for the ranges 100-90, 89-70, 69-50, 49-35 and
34-0.
Outline
fig06_08.c (Part 1 of 2)
rand ( )
FUNCTION
# include < stdlib.h >
Returns "random" number between 0 and
RAND_MAX (at least 32767)
CALLING:
int x = rand ( ) ;
A call goes to " rand ( ) " , it generates a number
and returns to x
rand ( )
Rolling a die
rand ( ) % 6 =?
Result has to be between 0 and 5 inclusive
1 + rand ( ) % 6
It will randomly generate number between
1 and 6
It has only two possibilities 0 / 1
rand ( ) % 2 ;
Example: Tossing a Coin
