Concatenate strings in c

**programinproces** · 11-28-2013

I am getting error"incompatible integer to pointer conversation..." and don't know how to fix this. In my code, user inters line like this (3+3*(55-52)) I need to separate number from the line so I can do other operation.here is my code

Code:

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


int main()
{
    int i=0;
    int j=0;
    char s[50];
    printf(":");
    scanf("%s",s);
    char n[5];
    while(s[i]!='\n' || s[i]=='+' || s[i]=='-'|| s[i]=='*'||s[i]=='/'|| s[i]=='(' ||s[i]==')')
    {
        
            if(j==0)
            {
                strcpy(n,s[i]);   //error
            }
            
            strcat(n,s[i]);       //error
        printf("%s",n);


        i++;
    
    }
        
    
    return 0;
}

**c99tutorial** · 11-28-2013

The function strcat and strncat concatenate one string onto another. In another words, both parameters must be char *. To concatenate a single character onto a string, you will need to do it slightly differently. For example you could implement a small function which in turn calls strcat

Code:

void concat_c(char *restrict str, char c, size_t n)
{
	char c_str[2];
	c_str[0] = c;
	c_str[1] = '\0';
	strncat(str, c_str, n);
}	

// put '!' at the end of "hello" and print the result
int main()
{
	char str[100] = "hello";
	char c = '!';
	concat_c(str, c, 100);	
	puts(str);
}

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