I got a problem here....hopefully got some1 teach me how to solve the problem...here is the question

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

int main()
{   float n1 ;
    char str1[10],str2[10],str3[10],str4[10];

         printf("Enter sentence like ¡°x grams in kilograms ?\n");
                           scanf("%f %s %s %s %s",&n1,str1,str2,str3,str4);
         
         int strcmp(const char *grams  ,const char *kilograms);
            if(1 grams = 1*0.001 kilograms);
                 printf("%f %s = %f %s\n",n1,str1,str2,str3);

        system("pause");
        return 0;
}

the output needed is :
Enter sentence like “x grams in kilograms ?”: 10 kilograms in grams ?
10 kilograms = 10000 grams.

i donno how to use the strcmp. can any1 teach me ??  
>> if(1 grams = 1*0.001 kilograms);
                 printf("%f %s = %f %s\n",n1,str1,str2,str3);

how to put the 1 grams = 1*0.001 answer to printf ?
i mean 1 grams is 0.001 kg right ? how to put the answer into printf ?  cause i never store the answer ...CX

Hi onlylonely.. long time!

First of all, please change the title of your thread to something that is more relevant to the contents, such as "C++ question".  That way, other experts might jump in and help.  

strcmp is for comparing two strings.  e.g.  strcmp(myStr1, myStr2)  If myStr1 and myStr2 are identical, it returns zero; else it returns the first position where they are different.  So, if myStr1 = "abcd" and myStr2 = "abcd", it returns zero;  if myStr1 = "abcd" and myStr2 = "abbk", it returns 2.  That's what I remembered but I could be wrong.

I don't quite understand your question so can you tell us more.  Is your program going to prompt user for a number in kilograms and it will calculate the grams then print something like "5 kilograms = 5000 grams"?

Ya , you are right . I need to convert the Kilograms to grams .
For example :
10 kilograms in grams ?
output : 10 kilograms = 10000 grams.

Then you do not need strcmp() I guess.  The steps should be something like the following:

1. prompt user for a numeric value using scanf
2. convert the input to grams and store the new value in a variable
3. display the output using printf

I would skip step 2 for now, just see if you can do step 1 and 3 so that it will prompt user for a value and then you output the same value.  For example:

x kilograms in grams ? 6
output: 6 kilograms

If you can get that to work, you got 80% done.  Tell us where you are stuck and we'll try to help.