CCF历真试题练习题库C语言答案.doc

题1：出现次数最多的数

#include int main() {

int i,j, n, s; int t = 1;

int a[10001] = {0}; scanf(\

for (i = 0; i < n; i++) {

scanf(\下标为输入值，每个数组值为输入频数 a[s]++;

if (a[s] > a[t]) t=s;

if (a[s] == a[t]) t=(s

printf(\ return 0; }

题2：ISBN号码

#include int main() {

int sum=0;

char a[13] = {'\\0'}; gets(a);

sum = (a[0] - '0')*1 + (a[2] - '0') * 2 + (a[3] - '0') * 3 + (a[4] - '0') * 4 + (a[6] - '0') * 5 + (a[7] - '0') * 6 + (a[8] - '0') * 7 + (a[9] - '0') * 8 + (a[10] - '0') * 9;

if ((sum == a[12]-'0')||(sum==10&&a[12]=='X')) //注意正确情况几种类型 {

printf(\ } else {

if (sum == 10) a[12] = 'X'; else

a[12] = sum + '0'; puts(a); }

return 0; }

题3：相反数

#include int main() {

int i, j, n,t=0; int a[501];

scanf(\

for (i = 0; i < n; i++) {

scanf(\ }

for (i = 0; i < n-1; i++) {

for (j = i + 1; j < n; j++) {

if (a[i] + a[j] == 0) t++; } }

printf(\ return 0; }

题4：窗口

#include

typedef struct window1{ int x1,x2,y1,y2,order; } window;

void Inputwindow(window ws[],int n) {

int i;

for(i=1;i<=n;i++) {

scanf(\ ws[n-i].order=i; } }

int getpos(window ws[],int n,int x,int y) {

int i;

for(i=0;i

if(x>=ws[i].x1&&x<=ws[i].x2&&y>=ws[i].y1&&y<=ws[i].y2) {

return i; } }

return -1; }

void movewindow(window ws[],int n,int pos) {

window w=ws[pos]; int i;

for(i=pos-1;i>=0;i--) {

ws[i+1]=ws[i]; }

ws[0]=w; }

int main() {

int i,n,m,x,y,pos; scanf(\ window ws[n];

Inputwindow(ws,n); for(i=0;i

scanf(\ pos=getpos(ws,n,x,y); if(pos==-1){

printf(\ } else{

printf(\ movewindow(ws,n,pos); } }

return 0; }

题5：相邻数对 #include #include

int main() {

int i, j, n,t=0; int a[1001]; scanf(\

for (i = 0; i < n; i++) {

scanf(\ }

for (i = 0; i < n - 1; i++) {

for (j = i + 1; j < n; j++) {

if (abs(a[i] - a[j]) == 1) t++; } }

printf(\ return 0; }

题6：画图

#include int main() {

int i, j, n,k, t = 0; int a[101][4]; scanf(\

for (i = 0; i < n; i++) {

scanf(\ }

for (i = 0; i < 101; i++) {

for (j = 0; j < 101; j++) {

for (k = 0; k < n; k++) {

if (j >= a[k][0] && j = a[k][1] && i

if (k < n) t++; }

}

printf(\ return 0; }

题7：门禁系统

#include int main() {

int i, n, s = 0; int a[1001] = { 0 }; scanf(\

for (i = 0; i < n; i++) {

scanf(\ a[s]++;

printf(\ }

return 0; }

题8：z字形扫描

#include int main() {

int i, j, k, n; int a[500][500]; scanf(\

for (i = 0; i

for (j = 0; j

scanf(\ } }

for (k = 0; k<2 * n - 1; k++) {

for (i = 0; i

for (j = 0; j

if (i + j == k)