For help, circulation cannot be terminated.-CodePudding

To learn to write a simple c + +, array assignment application, with the DEV of c + + 5.11.
Out of a strange question, comment the line in the program can lead to circulation can't jump out, thought for a long time do not understand,
#include
using namespace std;

Int main () {
Unsigned char c=0, d=0;
Unsigned int e [255] [255].
Do {
if(! (255) (int) c ^) {
break;
}
C + +;
D=0;
Do {
Cout & lt; <(int) c & lt; <", "& lt; <(int) d & lt; E [c] [d]=c + d;//this line can not jump out of the loop,
Cout<[" e "& lt; & lt; (int) c & lt; & lt;"] "& lt; <"[" & lt; & lt; (int) d & lt; & lt;"] "& lt; <":" & lt; if(! (255) (int) ^ d) {
break;
}
D++;
} the while (1);
} the while (1);
return 0;
}

CodePudding user response:

Reference:

 # include & lt; Iostream> 
using namespace std; 

Int main () 
{
Unsigned char c=0, d=0; 
Unsigned int e [255] [255]. 
Do {
if(! (254) (int) c ^) {//an array subscript is a scale of 0-254255 to cross-border 
break; 
} 
C + +; 
D=0; 
Do {
Cout & lt; <(int) c & lt; <", "& lt; <(int) d & lt; E [c] [d]=c + d;//this line can not jump out of the loop, 
Cout<[" e "& lt; & lt; (int) c & lt; & lt;"] "& lt; <"[" & lt; & lt; (int) d & lt; & lt;"] "& lt; <":" & lt; if(! (254) (int) ^ d) {//an array subscript is a scale of 0-254255 to cross-border 
break; 
} 
D++; 
} the while (1); 
} the while (1); 

System (" pause "); 
return 0; 
} 


//output: 
//1, 0 
//e [1] [0] : 1 
//1, 1 
//e [1] [1] : 2 
//1, 2 
//e [1] [2] : 3 
//... 
//... 
//e [1] [253] : 254 
//1254 
//e [1] [254] : 255 
//2, 0 
//e [2] [0] : 2 
//2, 1 
//e [2] [1] : 3 
//2, 2 
//e [2] and [2] : 4 
//2, 3 
//e [2] [3] : 5 
//... 
//... 
//254250 
//e [254] [250] : 504 
//254251 
//e [254] [251] : 505 
//254252 
//e [254] [252] : 506 
//254253 
//e [254] [253] : 507 
//254254 
//e [254] [254] : 508 
//please press any key to continue...

CodePudding user response:

Starting from 0, also need to adjust the sentence order, still have to wait for it some time:

 # include & lt; Iostream> 
using namespace std; 

Int main () 
{
Unsigned char c=0, d=0; 
Unsigned int e [255] [255]. 
Do {
D=0; 
Do {
Cout & lt; <(int) c & lt; <", "& lt; <(int) d & lt; E [c] [d]=c + d; 
Cout<[" e "& lt; & lt; (int) c & lt; & lt;"] "& lt; <"[" & lt; & lt; (int) d & lt; & lt;"] "& lt; <":" & lt; if(! (254) (int) ^ d) {//an array subscript is a scale of 0-254255 to cross-border 
break; 
} 
D++; 
} the while (1); 

if(! (254) (int) c ^) {//an array subscript is a scale of 0-254255 to cross-border 
break; 
} 
C + +; 
} the while (1); 

System (" pause "); 
return 0; 
} 


//output: 
//0, 0 
//e [0] [0] : 0 
//0, 1 
//e [0] [1] : 1 
//0, 2 
//e [0] [2] : 2 
//0, 3 
//e [0] [3] : 3 
//0, 4 
//e [0] [4] : 4 
//... 
//... 
//1, 0 
//e [1] [0] : 1 
//1, 1 
//e [1] [1] : 2 
//1, 2 
//e [1] [2] : 3 
//... 
//... 
//e [1] [253] : 254 
//1254 
//e [1] [254] : 255 
//2, 0 
//e [2] [0] : 2 
//2, 1 
//e [2] [1] : 3 
//2, 2 
//e [2] and [2] : 4 
//2, 3 
//e [2] [3] : 5 
//... 
//... 
//254250 
//e [254] [250] : 504 
//254251 
//e [254] [251] : 505 
//254252 
//e [254] [252] : 506 
//254253 
//e [254] [253] : 507 
//254254 
//e [254] [254] : 508 
//please press any key to continue...

CodePudding user response:

Can be seen from the breakpoint debugging, variable c, and d is placed behind the array e, the code in the array operation of crossing the line, is the one line of code that added annotations for cross-border operation (array subscript is legally 0-254), covering the c, d value, the loop will not terminate,