练习
if(x>y)
z=x; x=y; y=z;
(A)10 20 30
(B)20 30 10
(C)20 30 30
(D)30 20 10
(A)if(x>y) x=1;
(B)if(x=y)&&(x!=0) x+=y;
(C)if(x!=y) scanf("%d",&x);
(D)if(x<y){x++;y++};
#include <stdio.h>
main() {
int x = 1, y = 0, a = 0, b = 0;
switch (x) {
case 1:
switch (y) {
case 0: a++; break;
case 1: b++; break;
}
case 2:
a++; b++; break;
}
printf("a=%d,b=%d", a, b);
}
(A)a=1,b=0
(B)a=2,b=1
(C)a=2,b=2
(D)a=0,b=0
#include <stdio.h>
main() {
int i;
for (i = 1; i <= 5; i++)
switch (i % 5) {
case 0: printf("*"); break;
case 1: printf("#"); break;
default:printf("\n");
case 2:printf("&");
}
}
(A)
#&
&
&*
(B)
#&
&*
(C)
#&
&
(D)
#&&&*
#include <stdio.h>
main()
{
int i = 0, j = 0, k = 0, m;
for (m = 0; m < 3; m++)
switch (m) {
case 0: i = m++;
case 1: j = ++m; break;
case 2: k = m++;
case 3: ++m;
}
printf("%d, %d, %d,%d", i, j, k, m);
}
(A)0,2,0,4
(B)1,2,1,4
(C)0,2,0,3
(D)0,3,2,4
#include <stdio.h>
main()
{
int sum = 10;
for (int i = 100; i <= 10; i++)
sum = sum + i;
printf("%d", sum);
}
(A)10
(B)100
(C)5050
(D)5005
(A)i>6
(B)i<=6
(C)i<7
(D)i<6
#include <stdio.h>
main(){
int i;
for (i = 0; i < 3; i++)
switch (i)
{
case 0: printf("%d", i);
case 1: printf("%d", i);
default: printf("%d",i);
}
}
F1=1 (n=1)
F2=1 (n=2)
....
Fn=F(n-2)+F(n-1) (n>2)
选择填空答案
1、C 2、D 3、B 4、A 5、C 6、A 7、D 8、000112
9、
#include <stdio.h>
main(){
int a,b,c,i;
for (i = 100; i <= 999; i++)
{
a = i / 100;
b = i % 100 / 10;
c = i % 10;
if (i == a*a*a + b*b*b + c*c*c)
printf("%d,", i);
}
}
10、
#include <stdio.h>
void main(){
int z,k,s,q;
char c;
z = k = s = q = 0;
for (c = getchar(); c != '\n';)
{
if (c >= 'a'&&c <= 'z' || c >= 'A'&&c <= 'Z')
z++;
else if (c == ' ')
k++;
else if (c >= '0'&&c <= '9')
s++;
else q++;
c = getchar();
}
printf("字母:%d,空格:%d,数字:%d,其他:%d", z, k, s, q);
}
11、
#include <stdio.h>
void main() {
int n, i;
printf("请输入一个大于3整数:");
scanf_s("%d", &n);
for (i = 2; i <= n - 1; i++)
if (n%i == 0) break;
if (i < n)
printf("%d 不是素数\n", n);
else printf("%d 是素数\n", n);
}
12、
#include <stdio.h>
void main() {
int f1 = 1, f2 = 1, f3; int i;
printf("%12d\n%12d\n", f1, f2);
for (i = 1; i <= 38; i++)
{
f3 = f1 + f2;
printf("%12d\n", f3);
f1 = f2;
f2 = f3;
}
}