int main(){
// Two integers j and k
int j = 4;
int k = 5;
// Display them pre and post swap to show inplace_swap() working
printf("j = %d, k = %d\n", j, k);
inplace_swap(&j,&k);
printf("j = %d, k = %d\n", j, k);
int a[4] = {1,2,3,4,}; // array #1 - 4 elements
int b[5] = {1,2,3,4,5}; // array #2 - 5 elements, to show an odd number
// Print out the array post reversal
reverse_array(a, (sizeof(a)/sizeof(*a)));
for(int i=0; i < (sizeof(a)/sizeof(*a)); i++){
printf("%d ", a[i]);}
printf("\n");
// Print out the array post reversal
reverse_array(b, (sizeof(b)/sizeof(*b)));
for(int i=0; i < (sizeof(b)/sizeof(*b)); i++){
printf("%d ", b[i]);}
printf("\n");
return 0;
}
/* $begin reverse-array */
void reverse_array(int a[], int cnt) {
int first, last;
for (first = 0, last = cnt-1;
first <= last; //line:data:prob:reverse
first++,last--)
inplace_swap(&a[first], &a[last]);
}
void reverse_array(int a[], int count){
int first, last;
for(first=0, last=count-1; first < last; first++, last--){
inplace_swap(&a[first], &a[last]);
}
}
int main()
{
int x = 1, y = 2;
printf("Before swap:\n");
show_int(x);
show_int(y);
inplace_swap(&x, &y);
printf("After swap:\n");
show_int(x);
show_int(y);
return 0;
}
reverse_array(int a[], int cnt) {
int first, last;
int x = 2;
int y = 2;
inplace_swap(&x, &y);
printf("________________________\n");
for (first = 0, last = cnt - 1;
first <= last;
first++, last--) {
if (first == last) {
printf("index---%d------%d\n", first, last);
printf("111111111111111%d------%d\n", a[first], a[last]);
inplace_swap(&a[first], &a[last]);
printf("222222222222222%d------%d\n", a[first], a[last]);
} else {
inplace_swap(&a[first], &a[last]);
}
}
return a;
}
int main(void) {
test_show_bytes(0x12345678);
practice2D2();
const char *s = "ABCDEF";
show_bytes((byte_pointer) s, strlen(s));
int a = 20, b = 30;
inplace_swap(&a, &b);
printf("a=%d, b=%d\n", a, b);
practice2D7();
practice2D8();
practice2D10();
practice2D11();
}
void swap(){
int i;
int par[2];
char p;
start:
printf("switch integer or character to be done,integer input 1 \
and character input 2,and array input 3,exit input 4\n");
scanf("%d",&i);
switch(i){
case 1:
goto integer;
break;
case 2:
goto character;
break;
case 3:
goto array;
break;
case 4:
goto end;
break;
default:
printf("input error");
goto start;
}
character:
printf("input two characters\n");
i = 0;
while(i<2){
p = getchar();
if(p != ',' && p != ' ' && p != 10){
par[i] = p - '\0';//or par[i] = (int)p
i++;
}
}
goto do_char;
integer:
printf("input two integers\n");
scanf("%d",&par[0]);
scanf("%d",&par[1]);
goto do_int;
array:
printf("input 1 for int and 2 for char array\n");
int j,length,z;
int array[100];
int k;
scanf("%d",&j);
switch(j){
case 1:
printf("enter the length of array\n");
scanf("%d",&length);
printf("input for array\n");
for(k=0;k<length;k++){
scanf("%d",&array[k]);
//printf("%d\n",array[k]);
}
goto do_array_int;
break;
case 2:
printf("enter the length of array\n");
scanf("%d",&length);
printf("input for array\n");
char q;
k=0;
while(k<length){
q = getchar();
if(q != ',' && q != ' ' && q != 10){
array[k] = q - '\0';//or par[i] = (int)p
k++;
}
}
goto do_array_char;
break;
default:
printf("input error");
goto array;
break;
}
goto array;
do_char:
inplace_swap(&par[0],&par[1]);
printf("%c %c\n",par[0],par[1]);
goto start;
do_int:
inplace_swap(&par[0],&par[1]);
printf("%d %d\n",par[0],par[1]);
goto start;
do_array_int:
reverse_array(array,length);
for(z=0;z<length;z++)
printf("%d ",array[z]);
printf("\n");
goto start;
do_array_char:
reverse_array(array,length);
for(z=0;z<length;z++)
printf("%c ",array[z]+'\0');
printf("\n");
goto start;
end:
printf("good bye\n");
}
void reverse_array(int a[], int cnt) {
int frist, last;
for (frist = 0, last = cnt - 1; frist <= last; frist++, last--) {
inplace_swap(&a[frist], &a[last]);
}
}
