Thread: Reading in data from Text file

Originally Posted by tabstop

Switch requires an integral type to switch on. However: you happen to have some integers hanging around -- or at least you did a minute ago. chart1[k][0] (for k from 0 to 9) were your city names, correct? Compare your string against those strings (hey hey it's a loop), and then you can switch on k.

hmmmm im not here with u on this one, im confussed

Ignoring switches for the moment: I'm assuming you'll need to take some input (whether from a file or from a user) and match it against your railroad table or whatever that was. You already have the names of the cities stored in your array o' doom that we've been working with. F'rinstance: if your user enters "Cardiff", it's going to be nicer to deal with 3 (since that's Cardiff's row/column -- chart1[0][3] and chart1[3][0] both are "Cardiff") rather than keep "Cardiff" around. Also, that index is going to be what you need -- you won't be able to do chart1["Cardiff"]["York"], but you can do chart1[3][10].

Originally Posted by tabstop

Ignoring switches for the moment: I'm assuming you'll need to take some input (whether from a file or from a user) and match it against your railroad table or whatever that was. You already have the names of the cities stored in your array o' doom that we've been working with. F'rinstance: if your user enters "Cardiff", it's going to be nicer to deal with 3 (since that's Cardiff's row/column -- chart1[0][3] and chart1[3][0] both are "Cardiff") rather than keep "Cardiff" around. Also, that index is going to be what you need -- you won't be able to do chart1["Cardiff"]["York"], but you can do chart1[3][10].

the array of doom is just being used just to print out on screen the way im working out the distance is by using another array which follows

Code:

    int chart [10][10] = { // Array for the Table and Plot points
   {0,23,12,89,456,123,46,732,345,123},
   {23,0,46,234,123,46,89,234,567,90},
   {12,46,0,767,456,46,234,123,732,35},
   {89,234,767,0,732,32,48,67,98,100},
   {456,123,456,732,0,234,46,89,89,732},
   {123,46,46,32,234,0,123,46,123,234},
   {46,89,234,48,46,123,0,46,89,19},
   {732,234,123,67,89,46,46,0,123,732},
   {345,567,732,98,89,123,89,123,0,78},
   {123,90,35,100,732,234,19,732,78,0}
    };

ive done this because it seems easier to work with

i also have 2 ints startpoint and endpoint
i want it soooo when the user inputs their start point for instance london it will set startpoint to chart[0][0] and if the startpoint is for instance bath startpoint will be set as the value in chart[1][1].... welll alll the time the start point willl be 0 its the end point which will be confussing to work out this is how im tyrying to get it to run in my program:

Point1 : London = 0
Point2 : Cardiff = 12
The total distane is 12miles


i used to have my program like this which worked well but i cant have it so that im putting in a number which corresponds to the place name. i have to put in the place name thats why i was thinking of a switch statement or a if statement

Code:

   printf(" 1: London\n 2: Bath\n 3: Cardiff\n 4: Carlisle\n 5: Durham\n 6: Exeter\n 7: Leeds\n 8: Norwich\n 9: Truro\n 0: York\n -------------------\n\n");

            printf("\n Please enter your start point: "); // input first point
	        scanf("%5d", &point1);
				while(point1 < 1 | point1 >10)  // if the point is  not equal to a plot point  it will ask the user to re input
				 {
					printf("\n Invalid point pelase re enter : ");
					scanf("%5d", &point1);
				 }
			
			printf("\n Please enter your end point: "); // input secound point
	        scanf("%5d", &point2);
				while(point2 < 1 | point2 >10) 
				 {
					printf("\n Invalid point pelase re enter: "); // if the point is  not equal to a plot point  it will ask the user to re input
					scanf("%5d", &point2);
				 }
				 
	
			printf("\n Point1:%5d",chart[point1][point1]);
                    printf("\n Point2:%5d",chart[point1][point2]);
			printf("\n Total distance: %5d", chart[point1][point1]+chart[point1][point2]); // Adds the 2 points togteher to work out the distance 
			printf("\n\n\n");

thankyou

Originally Posted by fortune2k

the array of doom is just being used just to print out on screen the way im working out the distance is by using another array which follows

Code:

    int chart [10][10] = { // Array for the Table and Plot points
   {0,23,12,89,456,123,46,732,345,123},
   {23,0,46,234,123,46,89,234,567,90},
   {12,46,0,767,456,46,234,123,732,35},
   {89,234,767,0,732,32,48,67,98,100},
   {456,123,456,732,0,234,46,89,89,732},
   {123,46,46,32,234,0,123,46,123,234},
   {46,89,234,48,46,123,0,46,89,19},
   {732,234,123,67,89,46,46,0,123,732},
   {345,567,732,98,89,123,89,123,0,78},
   {123,90,35,100,732,234,19,732,78,0}
    };

splutter... If you've already got this array, then you didn't need the array of doom, just an additional array of the city names.

Anyway.

ive done this because it seems easier to work with

i also have 2 ints startpoint and endpoint
i want it soooo when the user inputs their start point for instance london it will set startpoint to chart[0][0] and if the startpoint is for instance bath startpoint will be set as the value in chart[1][1].... welll alll the time the start point willl be 0 its the end point which will be confussing to work out this is how im tyrying to get it to run in my program:

Point1 : London = 0
Point2 : Cardiff = 12
The total distane is 12miles


i used to have my program like this which worked well but i cant have it so that im putting in a number which corresponds to the place name. i have to put in the place name thats why i was thinking of a switch statement or a if statement

Code:

   printf(" 1: London\n 2: Bath\n 3: Cardiff\n 4: Carlisle\n 5: Durham\n 6: Exeter\n 7: Leeds\n 8: Norwich\n 9: Truro\n 0: York\n -------------------\n\n");

            printf("\n Please enter your start point: "); // input first point
	        scanf("%5d", &point1);
				while(point1 < 1 | point1 >10)  // if the point is  not equal to a plot point  it will ask the user to re input
				 {
					printf("\n Invalid point pelase re enter : ");
					scanf("%5d", &point1);
				 }
			
			printf("\n Please enter your end point: "); // input secound point
	        scanf("%5d", &point2);
				while(point2 < 1 | point2 >10) 
				 {
					printf("\n Invalid point pelase re enter: "); // if the point is  not equal to a plot point  it will ask the user to re input
					scanf("%5d", &point2);
				 }
				 
	
			printf("\n Point1:%5d",chart[point1][point1]);
                    printf("\n Point2:%5d",chart[point1][point2]);
			printf("\n Total distance: %5d", chart[point1][point1]+chart[point1][point2]); // Adds the 2 points togteher to work out the distance 
			printf("\n\n\n");

thankyou

So the last 98.7% of the work is done: all you have to do is to turn the input into the index point2. You have all the names of the cities, conveniently numbered, in your array. Compare the input to the city names in turn until you find a match (via strcmp). When you find a match, that's your point2 (actually it's point2+1, since your cities start at 1).

Originally Posted by tabstop

splutter... If you've already got this array, then you didn't need the array of doom, just an additional array of the city names.

Anyway.



So the last 98.7% of the work is done: all you have to do is to turn the input into the index point2. You have all the names of the cities, conveniently numbered, in your array. Compare the input to the city names in turn until you find a match (via strcmp). When you find a match, that's your point2 (actually it's point2+1, since your cities start at 1).

do you know of any tutorials or reading material on "strcmp" i have never came accross it

im confuzzed now

with this code:

Code:

 printf(" 1: London\n 2: Bath\n 3: Cardiff\n 4: Carlisle\n 5: Durham\n 6: Exeter\n 7: Leeds\n 8: Norwich\n 9: Truno\n 0: York\n -------------------\n\n");	   
            for(i=0;i<2;i++)
            {
               if(i==0){printf("\n Please enter your Start point: ");} // input first point 
               if(i==1){printf("\n Please enter your Finishing point: ");} // input first point         
               scanf("&#37;s", &pos[i]);
	             if( strcmp( pos[i], "London" ) == 0   ){point[i]=0;}
             else if( strcmp( pos[i], "Bath" ) == 0        ){point[i]=1;}
             else if( strcmp( pos[i], "Cardiff" ) == 0     ){point[i]=2;}
             else if( strcmp( pos[i], "Carlisle" ) == 0    ){point[i]=3;}
             else if( strcmp( pos[i], "Durham" ) == 0   ){point[i]=4;}
             else if( strcmp( pos[i], "Exeter" ) == 0     ){point[i]=5;}
             else if( strcmp( pos[i], "Leeds" ) == 0      ){point[i]=6;}
             else if( strcmp( pos[i], "Norwich" ) == 0   ){point[i]=7;}
             else if( strcmp( pos[i], "Truno" ) == 0       ){point[i]=8;}
             else if( strcmp( pos[i], "York" ) == 0         ){point[i]=9;}
             else{printf("Invalid place please Re enter");i--;}
             }
      
             printf("\n %-16s: %-5d miles",pos[0], chart[point[0]][point[0]]);
             printf("\n %-16s: %-5d miles",pos[1],chart[point[0]][point[1]]);
	     printf("\n Total distance  : %-5d miles", chart[point[0]][point[0]]+chart[point[0]][point[1]]); // Adds the 2 points togteher to work out the distance

im getting funny outputs for the place names
http://i57.photobucket.com/albums/g2...e2k/lobath.jpg
LoBath lol its ment to be London anyone know why

Originally Posted by Elysia

You still haven't fixed this:
http://cboard.cprogramming.com/showp...37&postcount=9

right i have fixxed that prob but when i put London as Start and Bath as finish

i get LoBath and Bath as outputs for place names as you can see in the picture