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Invalid conversion of char to float, different codes and no good results


Invalid conversion of char to float, different codes and no good results

By : Nguyễn Thế Trung
Date : November 22 2020, 03:01 PM
wish helps you Please try below code. It is self explanatory. If you need any specific explanation, please let me know.
code :
#include <stdlib.h>
#include <stdio.h>
#include <ctype.h>

int isnumeric_array(char *string)
{
    while( (char)(*string) != '\0') {
        if( !isdigit( (char)(*string) ) ) {
            return 0;
        }
        string++;
    }

    return 1;
}

int main(){
    char grade[128];
    float grade2;

read_input:
    memset(grade, 0x0, sizeof(grade));
    printf("Please, insert a grade between 0 and 10.\n");
    printf("Grade: ");
    scanf("%s", grade);

    if(isnumeric_array(grade) == 0) {
        goto read_input;
    }

    grade2 = atof(grade);
    if((grade2 < 0) || (grade2 > 10)) {
        goto read_input;
    }
    else {
        printf("You have entered right value\n");
    }

    system("PAUSE");
}


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Conversion of float* to char*, int* and char* does not produce expected results

Conversion of float* to char*, int* and char* does not produce expected results


By : Abilash
Date : March 29 2020, 07:55 AM
Does that help I got slightly different answers that you did (http://ideone.com/RG4uq) which is not really suprising given that the behavior of variadic functions with mixed floating point and integral types is undefined.
Here's what is happening. Assuming memory starts at address 0x50000000, 32-bit machine, little endian
code :
50000000  c3  f5  48  40   (a)
50000004  00  01  00  00   (b)
50000008  00  00  00  50   (p)
5000000c  04  00  00  50   (p1)
invalid conversion from 'const char*' to 'std::basic_ostream<char>::char_type {aka char}'

invalid conversion from 'const char*' to 'std::basic_ostream<char>::char_type {aka char}'


By : Koth Mane
Date : March 29 2020, 07:55 AM
Hope this helps ofstream::put() is for putting individual characters, not strings, to the stream.
If you want to print the string to the file stream, why not simply use <<:
Compare two char variable using strcmp in c++ shows invalid conversion from 'char' to 'const char*'

Compare two char variable using strcmp in c++ shows invalid conversion from 'char' to 'const char*'


By : Shashikant verma
Date : March 29 2020, 07:55 AM
seems to work fine The strcmp function compares two strings. If you want to compare two char variables, just use == or !=.
invalid conversion from ‘char*’ to ‘char’ [-fpermissive] and invalid types ‘char[int]’ for array subscript

invalid conversion from ‘char*’ to ‘char’ [-fpermissive] and invalid types ‘char[int]’ for array subscript


By : MatthiasF
Date : March 29 2020, 07:55 AM
With these it helps Addressing your type issues...
As wRAR says, it appears that the problem is with char* a; needing to be char** a;. A char* is a pointer type that refers to a block of memory to be interpreted as char values, such as in a string. What you seem to need here is a char**, which is a pointer type that refers to a block of memory to be interpreted as individual char* values, such as an array of strings.
C++ Invalid conversion from char* to char (char* = *string.begin() )

C++ Invalid conversion from char* to char (char* = *string.begin() )


By : Jonathan
Date : March 29 2020, 07:55 AM
wish helps you teststring.begin() returns an iterator, and if you dereference it with the * operator, you get a reference to a char (char&).
Therefore, you can take it's address like:
code :
char* begin = &*teststring.begin();
char* begin = &teststring[0];
char* begin = &teststring.front() //(C++11) [@Jonathan Wakely]
char * begin = myvector.data(); // (if T is char)
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