CODEWITHSUNDEEP
cstring
user2976686
user2976686

Reputation: 159

Try to insert string to array to check if the string describe function

I have a string describing the function and I need to check if this is function This idea came to me to put the string array then check

 the string: "1 11.1 2 3.2 3 44.1 4 5.4 5 7.4 6 1111.0"

the string describe the function (1,11.1),(2,3.2) (3,44.1) etc...

and I try to insert it to array like arr[0][0]=1 and arr[1][0]=11.1,arr[0][1]=2,arr[1][1]=3.2... And i need help how to do it or get advice to another idea how to check If the string is function?I hope I explained myself better..thanks

in to example the string:

 "1 11.1 1 3.2 3 44.1 4 5.4 5 7.4 6 1111.0"

isn't describe function because we have (1,11.1) and (1,3.2) the question is how to insert the string into array

EDIT for clarity:

He is asking the following question: Given a string of (apparently) evenly many floats, let's represent it in the form:

"x1 y1 x2 y2 x3 y3 ... xn yn"

Then the string "defines a function" if for every xi and xj with i different from j, if the values at xi and xj are the same, then the values at yi and yj are the same.

He wants to know how to check whether a string "defines a function."

Upvotes: 1

Views: 99

Answers (1)

BLUEPIXY
BLUEPIXY

Reputation: 40145

#include <stdio.h>
#include <string.h>
#include <stdlib.h>

int main(){
    {//split string by strtok, destroy input by strtok
        char input[] = "1 11.1 2 3.2 3 44.1 4 5.4 5 7.4 6 1111.0";
        char *array[10][2];
        char *item;
        char **to = &array[0][0];
        int i, count=0;
        for(item = strtok(input, " "); item != NULL; item = strtok(NULL, " ")){
            *to++ = item;
            ++count;
        }
        for(i = 0;i<count / 2;++i){
            printf("%s, %s\n", array[i][0], array[i][1]);
        }
    }
    printf("\n");
    {//convert double by strtod
        char *input = "1 11.1 1 3.2 3 44.1 4 5.4 5 7.4 6 1111.0";
        double array[10][2];
        double item;
        double *to = &array[0][0];
        char *p;
        int i, count=0, pairSize;
        for(p = input; *p != '\0';){
            item = strtod(p, &p);
            if(*p == ' ' || *p == '\0'){
                *to++ = item;
                ++count;
            } else {
                printf("invalid number\n");
                break;
            }
        }
        pairSize = count / 2;
        for(i = 0;i<pairSize;++i){
            printf("%g, %g\n", array[i][0], array[i][1]);
        }
        //Check the monotonic increase
        for(i = 0;i+1<pairSize;++i){
            if(array[i][0] >= array[i+1][0]){
                printf("invalid sequence at array[%d][0] = %g and array[%d][0] = %g\n", 
                    i, array[i][0], i+1, array[i+1][0]);
            }
        }
    }

    return 0;
}

Upvotes: 2

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