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#include<stdio.h>
int main(void){
int arr1[20];
int j = 0;
for (int i = 0;i <= 9;i++) {
arr1[i] = i;
}
for (int i = 10;i <= 19;i++) {
scanf_s("%d", &arr1[i]);
}
for (int i = 0;i <= 19;i++) {
printf("%d,", arr1[i]);
j++;
if (j == 5) {
printf("\n");
j = 0;
}
}
}


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#include<stdio.h>
int main(void) {
int arr1[10];
int j = 0;
for (int i = 0;i <= 9;i++) {
scanf_s("%d", &arr1[i]);
}
for (int i = 0;i <= 9;i++) {
printf("%d,",2 * arr1[9 - i]);
}
}


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#include <stdio.h>
int main() {
int a[16] = { 1, 3, 5, 6, 9, 12, 15, 18, 21, 24, 27, 30, 33, 36, 39, 42 };
printf("3的倍数的元素:\n");
for (int i = 0; i < 16; i++) {
if (a[i] % 3 == 0) {
printf("%d ", a[i]);
}
}
printf("\n");
printf("下标为3的倍数的元素:\n");
for (int i = 0; i < 16; i++) {
if (i % 3 == 0) {
printf("%d ", a[i]);
}
}
printf("\n");
return 0;
}

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#include<stdio.h>
int main(void) {
int arr1[16] = { 1,2,3,4,5,5,6,7,8,9,10,12,13,14,15,16 };
int arrnew[16];
int j = 0;
for (int i = 0;i <= 15;i++) {
if (arr1[i] % 3 != 0) {
arrnew[j++] = arr1[i];
}



}
for (int k = 0;k <j;k++) {
printf("%d,",arrnew[k]);
}
return 0;
}

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#include<stdio.h>
int main(void) {
int b;
int arr1[16] = { 1,2,3,4,5,5,6,7,8,9,10,12,13,14,15 };
scanf_s("%d\n", &b);
for (int i = 15;i>0;i--) {
arr1[i] = arr1[i-1];
}
arr1[0] = b;
for (int i = 0; i < 16; i++) {
printf("%d ", arr1[i]);
}

return 0;
}

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