`int` — C++ Keyword

The int keyword in C++: the natural signed integer type for the platform.

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`int`

The natural signed integer type for the platform, guaranteed to be at least 16 bits but typically 32 bits on all modern architectures.

Syntax

int n;
int n = 42;
unsigned int u = 42u;
long int l;   // int suffix is optional

Example

#include <print>
#include <climits>

int main() {
    int a = 10, b = 3;

    std::println("{}", a + b);   // 13
    std::println("{}", a / b);   // 3  (truncated integer division)
    std::println("{}", a % b);   // 1  (remainder)

    std::println("min: {} max: {}", INT_MIN, INT_MAX);
    // min: -2147483648 max: 2147483647 (on 32-bit int platforms)

    // Overflow is undefined behavior for signed int
    // int overflow = INT_MAX + 1;   // UB!
}

Notes

int is the default type for integer literals and the result of most arithmetic expressions.
Use std::int32_t / std::int64_t when exact width matters.
cppreference: int

int main() { // Pick one facility from this reference page. // Write the smallest program that exercises its main precondition, // complexity rule, or lifetime constraint before scaling up. return 0; }