How to write if in c language to judge multiple conditions
Mar 25, 2024 pm 03:24 PM
In C language, if statement is usually used to execute a specific block of code based on a single condition. However, multiple conditions can be combined to make a determination using logical operators such as &&, ||, and !. Including using logical AND (&&) to judge multiple conditions, using logical OR (||) to judge at least one condition, using logical NOT (!) to judge the negation of a single condition, as well as nesting if statements and using parentheses to clarify priority.
In C language, if statement is usually used to execute a specific block of code based on a single condition. However, if you want to execute code based on multiple conditions, you can use logical operators such as &&, ||, and ! to combine the conditions.
The following are some examples showing how to use if statements to determine multiple conditions in C language:
1. Use logical AND ( &&) Judge multiple conditions
When you want to check whether all conditions are true, you can use the logical AND operator &&.
c
##
#include <stdio.h>
int main() {
int a = 5;
int b = 10;
if (a > 0 && b > 0) {
printf("a 和 b 都大于 0\n");
} else {
printf("至少有一個(gè)數(shù)不大于 0\n");
}
return 0;
}2. Use logical OR (||) to determine multiple conditions
When you want to check that at least one condition is true, you can use the logical OR operator ||.
c
#include <stdio.h>
int main() {
int a = -5;
int b = 10;
if (a > 0 || b > 0) {
printf("至少有一個(gè)數(shù)大于 0\n");
} else {
printf("兩個(gè)數(shù)都不大于 0\n");
}
return 0;
}3. Use logical NOT (!) to determine the negation of a single condition
If you want to check if a condition is not true, you can use the logical NOT operator!.
c
#include <stdio.h>
int main() {
int a = 0;
if (!a) {
printf("a 不等于 0\n"); // 實(shí)際上這里會(huì)打印，因?yàn)?a 等于 0，所以 !a 為真
} else {
printf("a 等于 0\n");
}
return 0;
}4. Nested if statements
For more complex conditional judgments, you can also use nested if statements.
c
###include <stdio.h>
int main() {
int a = 5;
int b = 10;
if (a > 0) {
if (b > 0) {
printf("a 和 b 都大于 0\n");
} else {
printf("a 大于 0，但 b 不大于 0\n");
}
} else {
printf("a 不大于 0\n");
}
return 0;
}
When combining multiple logical operators, use parentheses to clearly specify the priority of the operation and avoid confusion.
c
#include <stdio.h>
int main() {
int x = 1;
int y = 2;
int z = 3;
if ((x == 1 && y == 2) || z == 3) {
printf("條件為真\n"); // 這里會(huì)打印，因?yàn)?(x == 1 && y == 2) 為真，或者 z == 3 也為真
} else {
printf("條件為假\n");
}
return 0;
}
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