โปรเเกรมภาษา c
Chapter 3 Chapter 3
C Language Control C Language Control
Contents
Decision / Selection
Format:
if (expression)
statement;
if then
Format:
if (expression) {
statement-1;
statement-2; statement-2;
…
}
Example if1.
#include <stdio.h>
#include <stdlib.h>
int main( ) {
int i;
scanf(“%d”, &i);
if (i > 0)
printf(“a positive number was entered\n”);
system(“PAUSE”);
return 0;
}
Example if2.c
#include <stdio.h>
#include <stdlib.h>
int main( ) {
int i;
scanf(“%d”, &i);
if (i < 0) {
printf(“a negative number was
i = -i;
}
system(“PAUSE”);
return 0;
}
printf(“a positive number w
system(“PAUSE”);
return 0;
}
if then else
Format: if (expression)
statement-true;
else else
statement-false;
if then else
Format:
if (expression) {
statement-1;
statement-2;
…
} else {
statement-3;
statement-4;
…
}
C Language Control C Language Control
Contents
- Decision / Selection
- Loop / Repetition
- Break and Continue Statement
Decision / Selection
- if then
- if then else
- Nested if
- switch switch
Format:
if (expression)
statement;
if then
Format:
if (expression) {
statement-1;
statement-2; statement-2;
…
}
Example if1.
#include <stdio.h>
#include <stdlib.h>
int main( ) {
int i;
scanf(“%d”, &i);
if (i > 0)
printf(“a positive number was entered\n”);
system(“PAUSE”);
return 0;
}
Example if2.c
#include <stdio.h>
#include <stdlib.h>
int main( ) {
int i;
scanf(“%d”, &i);
if (i < 0) {
printf(“a negative number was
i = -i;
}
system(“PAUSE”);
return 0;
}
printf(“a positive number w
system(“PAUSE”);
return 0;
}
if then else
Format: if (expression)
statement-true;
else else
statement-false;
if then else
Format:
if (expression) {
statement-1;
statement-2;
…
} else {
statement-3;
statement-4;
…
}
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