how to convert string to integer in c

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#include 
#include 
int main()
{
    char ch[]="123";
    int a=atoi(ch);
    printf("%d",a);
    return 0;
}

const char *number = "10";
char *end;
long int value = strtol(number, &end, 10); 
if (end == number || *end != '\0' || errno == ERANGE)
    printf("Not a number");
else
    printf("Value: %ld", value);

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