c語言if else語句_查找C程序的輸出（如果為else語句）| 設置1

c語言if else語句

Find the output of the following programs,

查找以下程序的輸出，

Program 1)

程序1)

#include <stdio.h>
int main()
{
int x = 400, y, z;
if (x >= 500)
y = 400;
z = 300;
printf("%d %d\n", y, z);
return 0;
}

Output

輸出量

32766 300

Explanation:

說明：

In the code, the condition x>=500 is false, so the variable y will not be assigned and the statement z=300 is written after the conditional statement, so it will be assigned with 300. Thus, the value of y will be a garbage value and value of z will be 300.

在代碼中，條件x> = 500為假，因此將不分配變量y，并且在條件語句之后寫入語句z = 300 ，因此將其分配為300。因此， y的值將為垃圾值和z的值為300。

Program 2)

程序2)

#include <stdio.h>
int main()
{
int p = 800, q, r;
if (p >= 700)
q = 600;
r = 500;
printf("%d %d\n", q, r);
return 0;
}

Output

輸出量

600 500

Explanation:

說明：

In the code, the condition p>=700 is true, so the variable q will be assigned with the value 600 and the statement r=500 is written after the conditional statement, so it will be assigned with 500. Thus, the value of q will be a 600 value and value of r will be 500.

在代碼中，條件p> = 700為true，因此將為變量q分配值600，并在條件語句后寫入語句r = 500 ，因此將其分配為500。因此， q將是600的值，而r的值將是500。

Program 3)

程序3)

#include <stdio.h>
int main()
{
int a = 30, b = 40;
if (a == b);
printf("%d %d\n", a, b);
return 0;
}

Output

輸出量

30 40

Explanation:

說明：

In the code, the condition if(a==b); is terminated with semicolon so the statement printf("%d %d\n",a,b); will not be consider as a body of the if statement. Thus, the program will print the value of a and b.

在代碼中，條件為if(a == b); 以分號終止，因此語句printf(“％d％d \ n”，a，b); 不會被視為if語句的主體。因此，程序將打印a和b的值。

Program 4)

程序4)

#include <stdio.h>
int main()
{
int e = 4;
float f = 4.0;
if (e == f) {
printf("E and F are equal\n");
}
else {
printf("E and F are not equal");
}
return 0;
}

Output

輸出量

E and F are equal

Explanation:

說明：

In the code, variable e is an integer type and variable f is a float type, while comparing them with an if statement (if(e==f)), the value of f will be truncated to an integer (due to implicit type conversion). Thus, the condition will be true and "E and F are equal" will be printed.

在代碼中，變量e是整數類型，變量f是浮點類型，將它們與if語句( if(e == f) )進行比較時， f的值將被截斷為整數(由于隱式類型)轉換)。因此，條件為真，并且將打印“ E和F相等” 。

Program 5)

程序5)

#include <stdio.h>
int main()
{
int p = 4, q, r;
q = p = 15;
r = p < 15;
printf("p = %d q = %d r = %d\n", p, q, r);
return 0;
}

Output

輸出量

p = 15 q = 15 r = 0

Explanation:

說明：

In the code, the statement q = p = 15; is assigning 15 to the variables p and q and the statement r = p<15; is assigning 0 to the variable r because p is not less than 15 (condition is false). Thus, the value of p, q and r will be 15, 15, and 0.

在代碼中，語句q = p = 15; 將變量p和q賦值為15，并且語句r = p <15；因為p不小于15(條件為假)，所以將0賦給變量r 。因此， p ， q和r的值將分別為15、15和0。

Program 6)

計劃6)

#include <stdio.h>
int main()
{
int i = 65;
char j = 'A';
if (i == j) {
printf("This place is beautiful\n");
}
else {
printf("This place is not beautiful\n");
}
return 0;
}

Output

輸出量

This place is beautiful

Explanation:

說明：

The character variable stores the ASCII code of the given character (it's also a number type of variable). Thus, the value of j will be 65 (The ASCII Code of 'A' is 65). So the condition if(i==j) will be true and "This place is beautiful" will be printed.

字符變量存儲給定字符的ASCII碼(它也是變量的數字類型)。因此， j的值為65(“ A”的ASCII碼為65)。因此條件if(i == j)將為true，并且將打印“這個地方很漂亮” 。

Program 7)

計劃7)

#include <stdio.h>
int main()
{
float p = 13.25, q = 14.5;
if (p = q) {
printf("Hello\n");
}
return 0;
}

Output

輸出量

Hello

Explanation:

說明：

In the statement if(p=q), p=q is not a comparison operation, we used = (assignment operator), thus the value of q will be assigned into p and the statement will be evaluated to 14.5 which is a non-zero value and conditional will be true.

在語句if(p = q) ， p = q不是比較運算的情況下，我們使用= (賦值運算符)，因此q的值將分配給p，并且該語句的計算結果為14.5 ，這不是零值和條件將為真。