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Using strtol
#include <stdio.h>
#include <stdlib.h>
int main()
{
const char *string = "-1234567abc";
char *remainderPtr;
long x;
x = strtol( string, &remainderPtr, 0 );
printf( "%s\"%s\"\n%s%ld\n%s\"%s\"\n%s%ld\n",
"The original string is ", string,
"The converted value is ", x,
"The remainder of the original string is ",
remainderPtr,
"The converted value plus 567 is ", x + 567 );
return 0;
}The original string is "-1234567abc"
The converted value is -1234567
The remainder of the original string is "abc"
The converted value plus 567 is -1234000
